01 - Preheat oven to 350°F. Lightly grease a 24-cup mini muffin tin with cooking spray or butter.
02 - Whisk together flour, baking soda, and salt in a medium bowl until well combined.
03 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, approximately 2 minutes.
04 - Add egg and vanilla extract to butter mixture. Beat until fully incorporated.
05 - Gradually add dry ingredients to wet ingredients, mixing until just combined. Do not overmix.
06 - Scoop about 1 tablespoon dough into each muffin cup. Press gently to form cup shape, pushing dough up the sides.
07 - Bake for 10 to 12 minutes until edges are lightly golden.
08 - Remove from oven. While still warm, gently press center of each cookie with back of spoon to deepen cup shape. Cool in tin for 10 minutes, then transfer to wire rack.
09 - Whip heavy cream, powdered sugar, and vanilla in chilled bowl until stiff peaks form.
10 - Fill each cooled cookie cup with whipped cream. Top with fresh berries, sprinkles, or mini chocolate chips as desired.