01 - Preheat oven to 350°F. Lightly grease a 24-cup mini muffin tin with cooking spray or butter.
02 - In a medium bowl, whisk together flour, baking soda, and salt until well combined.
03 - In a large bowl, beat softened butter and granulated sugar with an electric mixer on medium speed until light and fluffy, approximately 2 minutes.
04 - Add the egg and vanilla extract to the butter mixture. Beat until fully incorporated and smooth.
05 - Gradually add the dry ingredient mixture to the wet ingredients, mixing on low speed just until the flour disappears. Do not overmix.
06 - Scoop approximately 1 tablespoon of dough into each muffin cup. Using your fingers or the back of a spoon, gently press the dough into the bottom and up the sides to form a cup shape.
07 - Bake for 10 to 12 minutes, or until edges are lightly golden brown.
08 - Remove from oven and immediately use the back of a spoon to gently press the center of each cookie to deepen the cup shape. Cool in the pan for 10 minutes before transferring to a wire rack.
09 - In a chilled bowl, whip heavy cream, powdered sugar, and vanilla extract with an electric mixer on high speed until stiff peaks form.
10 - Fill each completely cooled cookie cup with whipped cream using a spoon or piping bag. Top with fresh berries, sprinkles, or mini chocolate chips as desired.