Step 1: Preheat the Oven - Start by preheating your oven to 350°F (175°C). This will ensure that your brownies bake evenly.
Step 2: Melt the Chocolate and Butter - In a large mixing bowl, combine the chocolate chips and unsalted butter. Melt them together in the microwave in 30-second increments, stirring in between, until smooth and glossy.
Step 3: Combine the Sugars - Once the chocolate and butter mixture is melted, add the granulated sugar and dark brown sugar. Whisk until fully combined and the mixture is glossy.
Step 4: Add Eggs and Egg Yolks - Add the eggs and egg yolks to the mixture. Whisk vigorously until the batter is smooth and well combined, which adds to the fudgy texture of the brownies.
Step 5: Incorporate the Flour - Gently fold in the all-purpose flour using a spatula. Be careful not to overmix; you want to keep the batter thick and fudgy.
Step 6: Prepare the Baking Pan - Line your 9x13 inch baking pan with parchment paper, leaving some overhang for easy removal. Pour the brownie batter into the pan and spread it evenly.
Step 7: Swirl in the Raspberry Filling - Dollop the raspberry pie filling over the brownie batter in spoonfuls. Use a knife or a skewer to gently swirl the filling into the batter, creating a beautiful marbled effect.
Step 8: Bake the Brownies - Place the pan in the preheated oven and bake for about 25-30 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs. Be careful not to overbake; the brownies should remain fudgy!
Step 9: Cool and Slice - Once baked, remove the brownies from the oven and let them cool in the pan for about 15 minutes. Then, lift them out using the parchment overhang and let them cool completely on a wire rack before slicing into squares.
