- 1 cup old-fashioned rolled oats
- 1/2 cup all-purpose flour
- 1/2 teaspoon baking soda
- 1/4 teaspoon salt
- 1/2 cup packed brown sugar
- 3/4 stick (6 tablespoons) unsalted butter, melted and cooled
- 1 large egg
- 1/2 teaspoon vanilla
- 3/4 teaspoon finely grated fresh orange zest
- 1/2 cup bittersweet or semisweet chocolate chips or chopped bittersweet chocolate (not more than 60% cacao)
- Put oven rack in middle position and preheat oven to 375°F. Butter a large baking sheet.
- Stir together oats, flour, baking soda, and salt in a bowl to combine.
- Whisk together brown sugar, butter, egg, vanilla, and zest in another bowl.
- Stir egg mixture into flour mixture until just combined. Stir in chocolate chips.
- Make 12 mounds of batter 1 1/2 inches apart on baking sheet. Bake until cookies are golden and edges are crisp, about 15 minutes.
- Transfer cookies to a rack to cool.