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, brown sugar, and granulated sugar using an electric mixer until light and fluffy.
Add the vanilla extract, salt, and lemon juice to the butter mixture, and mix until combined.
In another bowl, combine the all-purpose flour, rolled oats, and baking powder. Gradually add this dry mixture to the wet mixture, mixing until just combined.
Gently fold in the raspberries, being careful not to mash them.
Using a spoon or cookie scoop, drop the dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake in the preheated oven for about 12-15 minutes, or until the edges are golden brown and the cookies are set.
Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a cooling rack.