- 1 cup old-fashioned rolled oats
- 1/2 cup all-purpose flour
- 1/2 cup packed dark brown sugar
- 1/2 cup chocolate chips (milk or semisweet)
- 1/2 cup sweetened flaked coconut
- 1/4 teaspoon baking powder
- 1/4 teaspoon salt
- 5 tablespoons unsalted butter, melted and cooled
- 1 large egg
- 1/2 teaspoon vanilla
- Preheat oven to 350°F.
- Line a 9-inch square metal baking pan with a 12- to 14-inch-long sheet of foil, letting excess hang over sides, and butter foil in pan.
- Toss together oats, flour, brown sugar, chips, coconut, baking powder, and salt in a large bowl. Beat together butter, egg, and vanilla with a fork in another bowl, then stir into oat mixture until incorporated. Spoon batter into baking pan, patting evenly.
- Bake in middle of oven until set, about 25 minutes. Remove from pan by lifting ends of foil. Cool on a rack, then cut into 16 squares.