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 blended. Set aside.
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 approximately 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. Remove from oven.
08 - While warm, gently press center of each cookie with spoon back 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 cooled cookie cups with whipped cream. Top with berries, sprinkles, or chocolate chips as desired.