Fats: Most recipes use melted unsalted butter for flavor, though some substitute or add vegetable oil for a moister, boxed-mix texture. Sugars: Granulated white sugar is standard for a crackly top, but adding brown sugar increases moisture and fudginess. Chocolate: You can use unsweetened cocoa powder (natural or Dutch-processed) or melted baking chocolate. Binder: Large eggs (usually 2 to 4) provide structure and richness. Flour: All-purpose flour is the standard base; using less flour typically results in a fudgier brownie. Flavor Enhancers: Vanilla extract and a pinch of salt are essential for balancing the sweetness and deepening the chocolate flavor. Common Add-ins Texture: Chocolate chips or chunks, walnuts, pecans, or hazelnuts. Flavor Depth: A teaspoon of espresso powder can intensify the chocolate taste. Leavening: Some "cakey" brownie recipes include a small amount of baking powder or baking soda. Typical Measurement Example (8x8 Pan) A classic batch often follows these proportions: 1/2 cup butter, melted 1 cup sugar 2 large eggs 1/3 to 1/2 cup cocoa powder 1/2 cup flour