Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.
Beat softened butter and sugar in a large bowl until light and fluffy.
Add the egg and vanilla extract, mixing until fully combined.
In a separate bowl, whisk together flour, baking powder, and salt.
Gradually add dry ingredients to the wet mixture, mixing just until combined without overmixing.
Gently fold in crushed freeze-dried strawberries and crispy rice cereal until evenly distributed.
Scoop tablespoon-sized portions of dough onto baking sheets, spacing about 2 inches apart.
Bake for 12 to 15 minutes until edges are lightly golden.
Cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.
Optionally, dust with powdered sugar before serving.