One-Bowl Fudge Oreo Brownies Recipe (No Mixer)

I almost always keep Oreos in the pantry—bonus points if they’re double‑stuf. While developing a reliable brownie base, I knew Oreos belonged in the mix. To dial up the cookie flavor I swap some Dutch‑process cocoa for black cocoa powder. The batter comes together in one bowl, using brief bursts in the microwave to warm and help dissolve the sugar, followed by vigorous whisking for a shiny, crinkly top. Finely chopped chocolate folded in at the end gives the brownies a luxurious, fudge‑packed bite.

Using black cocoa powder

Black cocoa powder delivers an intense, nearly black color and a distinct Oreo‑like flavor. It’s essentially an extra‑dark Dutch‑processed cocoa and can be intense on its own, so this recipe balances it with regular Dutch‑process cocoa for depth without overpowering the brownie character.

If you don’t have black cocoa on hand, substitute an equal amount of Dutch‑process cocoa—your brownies will still be delicious, just a bit less dark and slightly different in flavor.

Grab your ingredients

• Black cocoa powder: Adds the signature Oreo color and flavor.
• Dutch‑process cocoa powder: Balances the black cocoa and keeps the brownies rich. Avoid swapping for natural cocoa if you want the same depth and color.
• Oreos: Regular or double‑stuff both work; double‑stuff gives extra creaminess.
• Espresso powder (optional): A small amount deepens the chocolate flavor without adding a coffee taste.

1. Step 1: Preheat the oven to 350°F (175°C). Line an 8×8 inch pan with parchment or foil, leaving an overhang for easy removal.
2. Step 2: Melt the butter in a large bowl. Add granulated and brown sugars and whisk until smooth. Return to the microwave 20–30 seconds if needed, then whisk for 1 minute to help dissolve the sugar.
3. Step 3: Whisk in vanilla, salt, Dutch‑process cocoa and black cocoa. It will look grainy at first — that’s normal. Warm for another 20–30 seconds if needed, then whisk until combined.
4. Step 4: Add eggs and the extra egg yolk, whisking 2–3 minutes until the mixture is glossy and smooth.
5. Step 5: Stir in the flour and espresso powder. Fold in finely chopped chocolate and chopped Oreos.
6. Step 6: Pour the batter into the prepared pan. Sprinkle a few extra chopped Oreos on top if desired. Bake 24–28 minutes, until the edges are set and the center still looks slightly soft.
7. Step 7: Cool completely in the pan before removing and slicing. For extra fudginess, chill in the refrigerator for a few hours or overnight.

Brownie baking tips

• Whisking matters: The microwave‑then‑whisk technique helps dissolve sugar and creates the shiny, crinkly top.
• Use a light metal pan: Metal conducts heat evenly. Glass pans often produce overcooked edges with an underdone center.
• Extra fudgy: Chill cooled brownies in the fridge for a few hours or overnight to intensify the fudgy texture.
• Chocolate choice: Finely chopped chocolate melts smoothly and contributes to the glossy top. Chocolate chips contain emulsifiers that can prevent full melting and reduce shine.

Storage & freezing

Store cooled brownies in an airtight container in the refrigerator for up to 5 days (room temperature is fine if you prefer). To freeze, place wrapped brownies in a freezer bag for up to 2 months. Thaw at room temperature before serving; a quick zap in the microwave and a scoop of vanilla ice cream make a delicious treat.

Recipe details

One Bowl Fudge Oreo Brownies

Prep time: 20 mins · Cook time: 26 mins · Total time: 46 mins · Servings: 16 brownies · Calories (approx.): 252 kcal per brownie

Equipment

• 8×8 inch baking pan
• Mixing bowl
• Whisk and rubber spatula
• Measuring spoons or kitchen scale
• Microwave (or double‑boiler alternative)

Ingredients

• 1 1/4 sticks (142 g) unsalted butter
• 1 cup (200 g) granulated sugar
• 1/2 cup (100 g) light brown sugar
• 1/2 cup (47 g) Dutch‑process cocoa powder
• 1/4 cup (16 g) black cocoa powder
• 1 tsp vanilla extract
• 1 tsp kosher salt
• 2 large eggs, room temperature
• 1 large egg yolk, room temperature
• 1/2 cup (60 g) all‑purpose flour
• 1 tbsp espresso powder (optional)
• 1/3 cup (56 g) finely chopped chocolate
• 16 Oreos, chopped (regular or double‑stuff)

Notes

This method is adapted from a well‑known crinkly brownie technique that uses brief heating and vigorous whisking to dissolve sugar and develop a glossy top. If you don’t have a microwave, you can heat the butter and sugar using a double boiler instead. If substituting salts, note that kosher salts vary in strength—adjust amounts accordingly.

Measurements here include metric weights; using a kitchen scale will give the most reliable results.

If you make these brownies, leave a review and share how they turned out. Enjoy!

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