1 1/4 cups all-purpose flour
1/2 teaspoon baking soda
1/2 teaspoon fine salt
1/3 cup packed light brown sugar
1/3 cup sugar
1 stick unsalted butter, room temperature
1/2 teaspoon pure vanilla extract
1 large egg
1/2 cup semisweet chocolate chips
Nonstick cooking spray
Special equipment: waffle iron (preferably Belgian style)