Use melted butter instead of oil
Replace water with milk or brewed coffee
Add an extra egg yolk for richer texture
Use only egg yolks for extra fudginess
Add vanilla extract
Mix in cocoa powder for deeper chocolate flavor
Add chocolate chips or chunks
Stir in chopped nuts
Add a pinch of salt
Add espresso powder
Use brown sugar instead of some of the white sugar if adding extra sweetener
Do not overmix the batter
Bake until just set for a fudgier center
Line the pan with parchment paper
Let brownies cool completely before cutting
Sprinkle flaky salt on top after baking
Add peanut butter, caramel, or cream cheese swirls
Use a smaller pan for thicker brownies
Toast nuts before adding them
Add marshmallows or crushed cookies
Brush the top with melted butter after baking for extra shine