Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
Beat in the egg and vanilla extract until well combined.
In a separate bowl, mix together the flour, rolled oats, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, stirring until combined.
Gently fold in the fresh raspberries, being careful not to crush them.
Using a spoon or cookie scoop, drop tablespoons of dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake in the preheated oven for about 15 to 20 minutes, or until the edges are lightly golden.
Remove from the oven and allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.