Preheat oven to 350°F.

Whisk together flour, baking soda, and salt in a small bowl. Beat together butter, sugars, and vanilla in a medium bowl with an electric mixer at high speed until pale and fluffy, about 3 minutes, then beat in egg until combined well. Reduce speed to low, then add flour mixture and mix until just combined. Stir in granola and chocolate chips.

Drop cookie batter by 2 tablespoons mounds 2 inches apart onto 2 large baking sheets lined with parchment paper. Then pat each mound into a 2 1/2-inch round.

Bake cookies, rotating sheets halfway through baking, until pale golden, about 13 minutes. Cool on sheets 1 minute, then transfer to racks to cool completely.