The Palmer House Brownie (Original Chicago Recipe)

This Chicago hotel brownie is a rich, dense chocolate bake made with walnuts and topped with a glossy apricot glaze. For a close home version, use a 9 × 13-inch pan, bake at 300°F, and take it out while the center is still moist. Cooling helps it set; a clean, dry toothpick is not the goal.

This is a good recipe to keep for the days when you want a dependable dessert without special equipment or tricky steps. The method is simple, but the low oven temperature and moist center call for a little patience. I focus on the cues that matter most: gentle melting, an even layer, set edges, and a glaze brushed on while the brownie is warm.

Pan, Ingredients & Preparation

The pan and ingredient amounts shape the brownie’s thickness, texture, and bake time. Use a light-colored 9 × 13-inch pan that is rated for at least 300°F. Measure everything before you begin, since the batter comes together quickly once the chocolate and butter are melted.

Ingredients

• 14 oz (397 g) semisweet chocolate, chopped
• 1 lb (454 g) butter
• 12 oz (340 g) granulated sugar
• 4 eggs
• 4 oz (113 g) all-purpose flour
• 1 tsp baking powder
• 1 lb (454 g) walnuts, crushed or chopped
• 1 tsp vanilla

For the apricot glaze:

• 1 cup water
• 1 cup apricot preserves
• 1 tsp unflavored gelatin

This generous amount of walnuts is part of the brownie’s character. Chop or crush them into small pieces so they spread through the batter and the brownie is easier to portion. If you prefer larger walnut pieces, keep them small enough to cut through cleanly with a knife.

Choose and prepare the pan

A light-colored aluminum or aluminized-steel pan is a practical choice. Aluminum conducts heat well; pure aluminum has a thermal conductivity of about 205 W·m⁻¹·K⁻¹, though a finished pan’s performance also depends on its alloy and construction. Induction compatibility does not matter here, because the pan goes in the oven, not on an induction burner.

Line the pan with parchment or lightly grease it. Check the manufacturer’s oven rating before use. Do not assume that every glass or metal pan has the same temperature limit or tolerates sudden temperature changes equally well.

Set out a heat-safe bowl, a saucepan for the double boiler, a spatula, and a clean brush or spoon for the glaze. A double boiler is simply a bowl set above gently simmering water. The bowl should sit over the saucepan without touching the water.

Key step: Heat the oven to 300°F (149°C), and prepare the pan before mixing.

Mixing, Baking & Apricot Glaze

The method combines melted chocolate and butter with eggs and sugar, then folds in the dry ingredients and walnuts. Bake the batter at 300°F for 30 to 40 minutes. The low temperature gives the thick, rich brownie time to set without relying on a hot oven or a dry center.

Mix the batter

1. Put the chopped chocolate and butter in a heat-safe bowl. Set the bowl over a saucepan of gently simmering water, making sure its base stays above the water.
2. Stir as the chocolate and butter melt. Remove the bowl from the heat when the mixture is smooth. Gentle heat helps prevent scorching; do not place the bowl directly over a strong flame or hot burner.
3. In a separate large bowl, combine the sugar and eggs. Stir until blended, then mix in the melted chocolate mixture and vanilla.
4. Add the flour and baking powder. Fold just until no dry patches remain, then fold in the walnuts. Avoid vigorous mixing once the flour goes in.
5. Spread the batter evenly in the prepared pan.

The double-boiler method is useful because the water transfers heat more gently than direct burner contact. Butter’s smoke point varies with its composition and is roughly 300–350°F (149–177°C). That range is not a reason to heat it hard on the stovetop; melt it with the chocolate slowly instead.

Bake by visual cues, not a dry toothpick

Bake for 30 to 40 minutes, checking at the 30-minute mark. Ovens and pans vary, so use the full range as a guide rather than assuming one exact finish time. The edges should look set, while the center should remain moist.

A toothpick inserted into the middle may come out with moist crumbs or a smear of batter. That does not automatically mean the brownie needs more time. The dense center continues to set as the pan cools. If you wait for the toothpick to come out clean and dry, the result may be dry and more cake-like.

Do not raise the oven temperature to shorten the bake. A hotter oven can set the edges before the dense center is ready. The practical target is set edges and a moist center, not a dry pick.

Make and apply the apricot glaze

While the brownie bakes, add the water and preserves to a small saucepan. Sprinkle the gelatin over the cool water and let it sit briefly to hydrate. Warm the mixture gently, stirring until the gelatin dissolves and the preserves blend in. Avoid a hard boil. Strain the glaze if you want a smoother finish.

Brush or spread the glaze over the brownie while it is warm. A warm surface helps the glaze spread in a thin, even layer. Use enough to coat the top without leaving puddles. If the glaze thickens before you use it, warm it gently until it is easy to spread again.

Key step: Glaze the brownie warm, then leave it in the pan to cool and set.

Cooling, Cleaning & Equipment Care

Cooling gives the moist center time to firm up and makes the brownie easier to cut. Keep it in the pan until it is set enough to handle, then use a clean knife and wipe the blade between cuts. After serving, let the pan cool fully before washing it.

Cool and portion

Place the hot pan on a dry, heat-safe surface or rack. Do not set it on a cold, wet counter or rinse it with cold water. Sudden temperature changes can warp metal or stress glass, and safe temperature limits vary by product.

Wait until the brownie is cool enough to hold its shape before cutting. For neat portions, use a long, sharp knife and wipe it clean between slices. The apricot glaze may make the knife sticky, so wiping also helps keep the top tidy. Cut smaller pieces if you want the walnuts and rich chocolate flavor to feel balanced in each serving.

Clean the pan safely

Once the pan is cool, wash it with warm water and mild detergent, then dry it fully. Avoid rough scouring tools if they could damage a nonstick coating. If bits of brownie stick, let the pan soak in warm water rather than scraping hard.

Use stainless steel or glass for any leftover acidic apricot glaze. Do not store it for a long time in unlined copper or reactive aluminum. Cool the pan naturally, then wash and dry it before putting it away.

Serving & Dining Presentation

The glaze gives the brownie a fruity finish over its chocolate-and-walnut base. Let the top set before serving so it is easier to portion. Cut the pieces to suit your table: small squares work well for a rich dessert, while larger pieces make a fuller serving.

This brownie does not need elaborate toppings. Serve it plain to let the apricot and walnut flavors stand out, or add a simple spoonful of whipped cream alongside. If you are making it ahead, keep it covered once fully cool. For the cleanest presentation, wipe the knife between cuts and lift each piece carefully.

Frequently Asked Questions

These answers cover the key choices that affect texture, timing, and handling. The main points are to keep the oven at 300°F, start checking at 30 minutes, and remove the brownie while the center is still moist. Let it cool before cutting so the rich middle can set.

What makes this a Palmer House-style brownie?
It is a dense chocolate brownie with walnuts and an apricot glaze, baked at a low temperature.

What size pan should I use?
Use a 9 × 13-inch (23 × 33 cm) pan rated for at least 300°F (149°C).

How long should I bake it?
Bake for 30 to 40 minutes. Start checking at 30 minutes because ovens and pans can vary.

Should the toothpick come out clean?
No. A clean, dry toothpick can signal an overbaked brownie. Look for set edges and a moist center.

Can I bake it at a higher temperature to save time?
No. A hotter oven may set the edges before the dense center is ready.

Why melt the chocolate and butter over water?
The bowl stays above gently simmering water, which heats the mixture gradually and helps prevent scorching.

Do I need to strain the apricot glaze?
No. Straining is optional. It removes pieces of fruit for a smoother finish.

When should I add the glaze?
Brush or spread it over the brownie while the brownie is still warm.

How do I get cleaner slices?
Let the brownie cool until set enough to cut. Use a clean knife and wipe it between cuts.

Can I rinse the pan while it is hot?
No. Let it cool first. Sudden temperature changes can warp metal or stress glass.

(This article was written by one of our staff writers, Steven R. Bancroft. Visit our Meet the Team page.)