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Hot Chocolate Brownies (Fudgy Winter Treat) - Cozy, Gooey, and Rich

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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 9 servings
Ingredients Method

Ingredients
  

  • 1/2 cup (115 g) unsalted butter, plus more for the pan
  • 4 oz (115 g) semi-sweet chocolate, chopped
  • 3/4 cup (150 g) granulated sugar
  • 1/4 cup (50 g) brown sugar
  • 2 large eggs, room temperature
  • 1 tsp vanilla extract
  • 1/3 cup (35 g) unsweetened cocoa powder
  • 1/4 cup (30 g) hot cocoa mix (regular or dark)
  • 1/2 cup (65 g) all-purpose flour
  • 1/4 tsp fine salt
  • 1/2 cup (85 g) chocolate chips
  • 1 cup mini marshmallows
  • Optional: flaky sea salt for finishing

Method
 

  1. Prep the pan. Heat oven to 350°F (175°C). Line an 8-inch square pan with parchment, letting it overhang for easy lifting. Lightly grease.
  2. Melt the chocolate. In a heatproof bowl, melt butter and chopped chocolate together over a saucepan of simmering water or in the microwave in 20–30 second bursts. Stir until smooth. Cool 3–4 minutes.
  3. Whisk eggs and sugars. In a mixing bowl, whisk granulated sugar, brown sugar, and eggs for 45–60 seconds until slightly thick and glossy. Whisk in vanilla.
  4. Combine the chocolate. Slowly whisk the melted chocolate mixture into the egg mixture until fully blended.
  5. Add dry ingredients. Sift in cocoa powder, hot cocoa mix, flour, and salt. Fold gently with a spatula just until no dry streaks remain. Do not overmix.
  6. Fold in mix-ins. Stir in chocolate chips and half the mini marshmallows.
  7. Fill the pan. Spread the batter evenly. Scatter the remaining marshmallows on top.
  8. Bake. Bake 22–26 minutes, until the edges are set and the center has a slight jiggle. A toothpick should come out with moist crumbs, not wet batter.
  9. Finish and cool. Sprinkle with a pinch of flaky sea salt, if using. Cool in the pan at least 30–45 minutes before slicing for clean squares. For gooier brownies, serve warm with a spoon.