Whisk flour, baking powder, and salt in a bowl and set aside.Cream butter and sugar until light and fluffy.Beat in the egg, then mix in lemon zest and lemon juice.Add dry ingredients and mix until just combined.Gently fold in raspberries.Chill dough for 30 minutes.Scoop dough onto lined baking sheets.Bake at 350°F for 12 to 14 minutes, then cool and serve.