One-Bowl Chocolate Fudge Brownie Bars

By AislePrompt Editorial · Published 2026-06-14 · Updated 2026-06-14

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.

Rich, fudgy chocolate brownie bars made in one bowl with simple ingredients, perfect for an easy crowd-pleasing dessert. This American-inspired recipe, ready in about 40 minutes, layers unsalted butter, granulated sugar, brown sugar 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 190 calories and feeds 24, 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: 10 min Cook: 30 min Serves 24 American cuisine 190 cal/serving

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Ingredients

1 cup (2 sticks) unsalted butter
1 1/2 cups granulated sugar
1/2 cup packed brown sugar
3 large eggs
2 tsp vanilla extract
1 cup all-purpose flour
3/4 cup unsweetened cocoa powder
1/2 tsp salt
1 cup semisweet chocolate chips

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Instructions

Step 1: Preheat oven to 350°F. Grease and line a 9x13-inch baking pan with parchment paper, leaving overhang for easy removal.
Step 2: In a microwave-safe bowl, melt 1 cup unsalted butter (2 sticks) gently for 1-2 minutes until fully melted; whisk in 1 1/2 cups granulated sugar and 1/2 cup packed brown sugar until smooth.
Step 3: Add 3 large eggs one at a time, whisking well after each addition, then stir in 2 tsp vanilla extract.
Step 4: Sift together 1 cup all-purpose flour, 3/4 cup unsweetened cocoa powder, and 1/2 tsp salt; fold gently into wet ingredients until just combined.
Step 5: Stir in 1 cup semisweet chocolate chips evenly.
Step 6: Pour batter into prepared pan, smoothing the top with a spatula. Bake for 28-32 minutes until edges are set and a toothpick inserted in the center comes out with a few moist crumbs.
Step 7: Cool completely in pan before lifting out using parchment overhang. Cut into 24 bars and serve.