Preheat oven to 350 degrees. Line two baking sheets with parchment paper.Advertisement
In a large bowl, whisk brown sugar, butter, egg, and vanilla until smooth. Mix in oats and almonds.
Drop mixture by level tablespoons onto prepared baking sheets, spacing about 2 inches apart. Spray the underside of a metal spatula with nonstick cooking spray, and use to flatten cookies into 2 1/2-inch disks.
Bake until golden, 14 to 16 minutes. Cool completely on baking sheets. (Handle with care; cookies are fragile.)