Melting Chocolate: Start by melting the semisweet chocolate and 4 tablespoons of butter together in a microwave-safe bowl or over a double boiler. Stir well until smooth and set aside to cool.

Dry Ingredients: In another bowl, sift together 1 cup of wheat flour, 2 tablespoons of sugar, 1 cup cocoa powder, and 1 teaspoon of yeast.

Mix Wet Ingredients: Add the 4 eggs to the dry ingredients and mix vigorously. Incorporate the cooled chocolate and butter mixture until well combined.

Prep the Baking Pan: Line a 20cm x 25cm square baking pan with parchment paper, ensuring it's well-greased.

Bake the Brownie Base: Pour the brownie mixture into the prepared pan and bake in a preheated oven at 180°C (350°F) for approximately 40 minutes or until the edges are firm and it starts to crack slightly.

Prepare the Brigadeiro Filling: While the brownies are baking, combine the condensed milk and 1 teaspoon of wheat flour in a saucepan, stirring until well blended. Add in the cream, white chocolate, and powdered milk. Cook on medium heat, stirring constantly until it thickens – about 5-7 minutes.

Filling the Brownies: After the brownies have cooled, carefully cut them into squares and use a knife to create a pocket for the brigadeiro filling. Spoon the brigadeiro mixture into each brownie.

Serve & Savor: Enjoy these delightful brownies warm or at room temperature, and watch as your friends and family savor every bite!