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