BROWNIE LAYER:
3/4 cup butter
1 1/2 cups semisweet chocolate chips
1 cup white sugar
1/2 cup brown sugar
4 large eggs
1 teaspoon vanilla extract
1/2 teaspoon salt
1 cup all-purpose flour
COOKIE DOUGH LAYER:
3/4 cup butter, room temperature or almost melted
3/4 cup white sugar
3/4 cup brown sugar
1/4 teaspoon salt
2 tablespoons milk
1 1/2 teaspoons vanilla extract
1 cup all-purpose flour
1 cup miniature chocolate chips