01 -
Heat the oven to 350°F (175°C). Spray an 8×12-inch pan with a bit of oil. Lay down parchment paper so it’s easy to lift out later. Put it aside for now.
02 -
Mix the melted butter, cooking oil, white and brown sugars in a bowl. Stir until smooth. Add the eggs and vanilla, and whisk for about a minute, or until it looks pale.
03 -
Sift together cocoa powder, salt, and flour into the wet mixture. Gently fold them together just until combined. Avoid overmixing so your brownies stay fudgy and not spongy.
04 -
Take about three-quarters of the chocolate chunks, and fold them gently into the batter so they’re spread out evenly.
05 -
Pour the brownie batter into the pan, spreading it out smoothly. Scatter the rest of the chocolate chunks over the top.
06 -
Pop the pan into the oven and bake for 25-30 minutes if you like a gooier texture. Bake 35-40 minutes for fully set brownies with a firmer bite. The center should be just set when touched. A toothpick should come out slightly coated if testing for fudgy centers. Remember, they’ll finish cooking a bit in the hot pan after coming out.
07 -
Let the brownies sit for 15-20 minutes, then carefully lift them out using the parchment edges. Wait until they’re at room temperature before slicing into 16 squares. They’ll firm up as they cool.