Seriously Fudgy Homemade Brownies

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1. 1Step 1: Preheat the oven to 350°F (177°C) and line a 9-inch square metal baking pan with parchment paper, leaving an overhang on two opposite sides to lift out the finished brownies (makes cutting easier!). Set aside.
2. 2Step 2: In a small microwave-safe bowl or liquid measuring cup, combine the butter and half (2oz/56g) of the chopped chocolate. Melt in 30-second increments, stirring after each, until completely melted and smooth. Set aside to slightly cool while you continue.
3. 3Step 3: In a large bowl with a handheld or stand mixer fitted with a whisk attachment, combine the sugar and eggs. Beat on medium-high speed until the sugar is dissolved and the mixture is pale and ribbon-y, about 3 minutes.
4. 4Step 4: Pour the warm melted butter/chocolate into the bowl with the sugar/eggs, add the vanilla, and beat or whisk to combine.
5. 5Step 5: With a fine mesh sieve, sift the cocoa powder and flour into the batter, add the salt, then whisk or beat on low speed to incorporate. Fold in the remaining 2 ounces/57g chopped chocolate and the chocolate chips. The batter will be very thick. Spread it evenly into the prepared pan. (A small offset spatula can help here.)
6. 6Step 6: Bake for 28–30 minutes, then test the brownies with a toothpick. Insert the toothpick into the center of the pan. If it comes out coated with wet batter, the brownies are not done. If there are only a few moist crumbs, the brownies are done. Keep checking every 2 minutes until you have moist crumbs. Brownies typically take 30–32 minutes in my oven. Err on the side of under-baking, as the brownies will continue to set as they cool.
7. 7Step 7: Remove from the oven and place on a cooling rack to cool completely in the pan. When cool, lift the brownies out by gripping the parchment overhangs and transfer to a cutting board. Use a sharp knife to cut into squares.
8. 8Step 8: Cover and store leftover brownies at room temperature for up to 1 week.