Classic Chocolate Chunk Brownie Bars

By AislePrompt Editorial · Published 2026-05-29 · Updated 2026-05-29

How this recipe was made — this recipe was drafted by AislePrompt's AI-assisted pipeline from technique templates and USDA-sourced nutrition data, and published by AislePrompt Editorial — see how AislePrompt recipes are developed and reviewed.

Fudgy and thick chocolate brownie bars studded with chunks of semi-sweet chocolate for an indulgent treat perfect for any occasion. This American-inspired recipe, ready in about 50 minutes, layers unsalted butter, granulated sugar, large eggs into a dessert worth slowing down for — great for weekend baking, holiday tables, or any time you want a sweet payoff at the end of a meal. Each serving lands at about 250 calories and feeds 16, so it slots into a weekend bake or a special-occasion dessert tray. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 15 min Cook: 35 min Serves 16 American cuisine 250 cal/serving

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Ingredients

1 cup (2 sticks), melted unsalted butter
2 cups granulated sugar
4 large eggs
2 tsp vanilla extract
1 1/4 cups all-purpose flour
1 cup unsweetened cocoa powder
1/2 tsp salt
1/2 tsp baking powder
1 cup semi-sweet chocolate chunks

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Instructions

Step 1: Preheat oven to 350°F (175°C). Line a 9x13 inch baking pan with parchment paper, leaving an overhang for easy removal.
Step 2: In a large bowl, whisk together 1 cup melted unsalted butter and 2 cups granulated sugar until combined.
Step 3: Beat in 4 large eggs one at a time, then mix in 2 tsp vanilla extract until smooth.
Step 4: Sift together 1 1/4 cups all-purpose flour, 1 cup unsweetened cocoa powder, 1/2 tsp salt, and 1/2 tsp baking powder.
Step 5: Gradually fold the dry ingredients into the wet ingredients until just combined.
Step 6: Fold in 1 cup semi-sweet chocolate chunks evenly into the batter.
Step 7: Pour the batter into the prepared pan and spread evenly with a spatula.
Step 8: Bake for 30-35 minutes until a toothpick inserted in the center comes out with a few moist crumbs.
Step 9: Cool completely in the pan on a wire rack before lifting out using the parchment overhang and cutting into bars.