Preheat the oven: Preheat the oven to 350°F (180°C). Line a large baking sheet with parchment paper.
Cream the butter and sugars: In a large mixing bowl, beat the softened butter, granulated sugar, and brown sugar with an electric mixer until smooth, light, and slightly fluffy.
Add the wet ingredients: Add the egg and vanilla extract. Beat again until fully combined and creamy.
Combine the dry ingredients: In a separate bowl, whisk together the flour, baking powder, and salt. Stir in the dried raspberry pieces until evenly distributed.
Make the dough: Gradually add the dry ingredients to the butter mixture. Mix just until a soft cookie dough forms. Do not overmix.
Portion the cookies: Use a medium cookie scoop to place portions of dough onto the prepared baking sheet, leaving space between each cookie.
Bake: Bake for 7-9 minutes, until the edges are set but the centers still look slightly soft.
Cool: Let the cookies cool on the baking sheet for 5 minutes, then transfer them to a wire rack to cool completely.