Set the oven to 350°F (175°C). Line a baking tray with parchment paper for even baking and easy cleanup.
In a medium bowl, whisk together flour, baking powder, baking soda, and salt until well combined.
In a separate bowl, beat softened butter with sugar until light and fluffy. Mix in the egg and vanilla, then stir in the strawberry powder until fully blended.
Slowly add the dry ingredients to the wet mixture, stirring just until the dough comes together. Don’t overmix—this keeps the cookies soft.
Scoop tablespoon-sized dough portions onto the tray, spacing them 2 inches apart. Gently press each one to slightly flatten.
Bake for 10–12 minutes until the edges turn light golden. Let them cool on the tray for 5 minutes, then move to a rack to cool completely.
In a small bowl, mix crushed vanilla wafers, crushed freeze-dried strawberries, and melted butter until crumbly.
Melt white chocolate chips and drizzle over the cooled cookies using a spoon or piping bag.
Immediately sprinkle the strawberry crunch topping over the drizzle and press lightly so it sticks. Let the chocolate set before serving.