Preheat oven to 350°F (175°C) and grease a 9x13-inch pan.
In a large bowl, mix melted butter and sugar until smooth.
Add eggs, one at a time, then stir in vanilla extract and red food coloring.
Sift together flour, cocoa powder, baking powder, and salt; fold into wet mixture.
Gently fold in crushed cookies and white chocolate chips if using.
Pour batter into prepared pan and spread evenly.
Bake for 30 minutes or until a toothpick inserted comes out mostly clean.
Cool completely before cutting into squares.
