These easy fudgy brownies are rich, chewy, and deeply chocolatey — ready in under an hour with simple ingredients and one bowl.
1/2 cup (1 stick) unsalted butter
1 cup granulated sugar
1/2 cup unsweetened cocoa powder
2 large eggs
1 tsp vanilla extract
1/2 cup all-purpose flour
1/4 tsp salt
Optional: 1/2 cup chocolate chips, chopped walnuts, or espresso powder
Preheat oven to 325°F. Line an 8×8-inch pan with parchment.
Melt butter and sugar in a saucepan over low heat. Stir until glossy.
Off heat, whisk in cocoa powder, then eggs and vanilla.
Fold in flour and salt until just combined. Add any mix-ins.
Spread batter in pan and bake for 28–32 minutes.
Cool, slice, and serve.
For a darker brownie, use Dutch-process cocoa and add 1/2 tsp espresso powder. Store in airtight container up to 4 days or freeze for 3 months.