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Prep Time: 15 minutes
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Cook Time: 30-35 minutes
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Cooling Time: 1 hour (minimum)
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Total Time: ~2 hours (including cooling)
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Skill Level: Beginner
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Yield: 16 generous brownies
Intensity Levels
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Preparation Effort: Low
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Baker Skill Required: Low
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Active Attention: Medium (mostly during melting and baking check)
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Cleanup: Low
Ingredients
Dry Ingredients:
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1 cup (90g) old-fashioned rolled oats (not quick oats)
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¾ cup (95g) all-purpose flour
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½ cup (50g) unsweetened cocoa powder (high-quality for best flavor)
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½ teaspoon baking powder
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½ teaspoon fine sea salt
Wet Ingredients:
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½ cup (115g) unsalted butter
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1 cup (200g) dark chocolate chips or chopped dark chocolate (divided)
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¾ cup (150g) granulated sugar
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½ cup (110g) packed light brown sugar
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2 large eggs, at room temperature
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2 teaspoons pure vanilla extract
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¼ cup (60ml) strong brewed coffee or water (coffee enhances chocolate flavor)
Optional Add-ins:
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½ cup (65g) chopped walnuts or pecans
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Flaky sea salt for sprinkling on top
Instructions
1. Prep and Preheat (5 mins)
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Preheat your oven to 350°F (175°C). Grease an 8×8 inch baking pan and line it with parchment paper, leaving an overhang on two sides for easy removal.
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In a medium bowl, whisk together the rolled oats, flour, cocoa powder, baking powder, and salt. Set aside.
2. Melt Chocolate and Butter (5 mins)
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In a medium, heatproof bowl, combine the butter and ½ cup (100g) of the dark chocolate chips. Melt in 30-second increments in the microwave, stirring well after each, until smooth. Alternatively, melt in a heatproof bowl set over a pot of simmering water (double-boiler method). Let cool slightly for 2-3 minutes.
3. Combine Wet Ingredients (3 mins)
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To the slightly cooled chocolate-butter mixture, whisk in the granulated sugar and brown sugar until well combined.
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Add the eggs one at a time, whisking vigorously after each until the mixture is smooth and slightly shiny.
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Whisk in the vanilla extract and coffee (or water).
4. Bring It All Together (2 mins)
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Add the dry ingredient mixture to the wet ingredients. Using a spatula or wooden spoon, fold gently until just combined and no dry streaks remain. Be careful not to overmix.
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Fold in the remaining ½ cup of chocolate chips and nuts (if using).
5. Bake to Perfection (30-35 mins)
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Pour the thick batter into your prepared pan, spreading it evenly into the corners.
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Bake for 30-35 minutes. The key to fudgy brownies is not overbaking. Start checking at 30 minutes. The brownies are done when the top is set and shiny with a few cracks, and a toothpick inserted into the center comes out with a few moist crumbs attached (not wet batter, but not clean).
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If using, sprinkle with a pinch of flaky sea salt immediately after removing from the oven.
6. The Crucial Cool (1 hour+)
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This is the most important step for clean cuts and perfect texture! Let the brownies cool completely in the pan set on a wire rack. This will take at least 1 hour. For the ultimate fudgy texture and easiest slicing, you can refrigerate the cooled pan for another hour before cutting.
7. Slice and Serve
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Use the parchment paper overhang to lift the entire brownie slab out of the pan. Place it on a cutting board.
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Using a sharp knife wiped clean between cuts, slice into 16 squares. For super-clean cuts, you can briefly run the knife under hot water and dry it.
Nutrition Information
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Serving Size: 1 brownie (1/16 of recipe, without optional nuts)
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Calories: ~240 kcal
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Total Fat: 12g
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Saturated Fat: 7g
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Cholesterol: 45mg
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Sodium: 100mg
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Total Carbohydrates: 32g
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Dietary Fiber: 2g
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Total Sugars: 22g
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Protein: 3g
Note: Nutritional information is an estimate calculated using a database and will vary based on specific ingredients and brands used. Optional add-ins will change the values.
Baker’s Notes & Success Secrets
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Ingredient Tips: Using high-quality cocoa powder and real dark chocolate makes a dramatic difference in flavor. Room temperature eggs incorporate more easily, creating a better emulsion.
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Oat Texture: For a more uniform texture, you can pulse the rolled oats in a food processor 3-4 times to break them down slightly. Do not turn them into flour.
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Storage: Store brownies in an airtight container at room temperature for up to 3 days, or in the refrigerator for up to a week. They can also be frozen for up to 3 months. Thaw at room temperature or warm briefly in the microwave.
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The Coffee Trick: Don’t worry—the coffee won’t make your brownies taste like coffee! It simply deepens and enriches the chocolate flavor. Water works perfectly fine if you prefer.
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Don’t Overbake: Err on the side of underbaking for the signature fudgy, moist center.
Enjoy the rich, chocolatey bliss of these hearty, oatmeal-studded brownies with a glass of cold milk or a cup of coffee!

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