Coat 2 standard 6-cup muffin pans with nonstickspray.
Whisk baking powder, salt, and 1 1/2 cupsflour in a medium bowl.
Whisk egg, brown sugar,butter, milk, and ginger in a large bowl; mix in dryingredients. Toss raspberries with remaining1 tablespoon flour in a small bowl; gently fold into batter.
Divide batter among muffin cups and bake until atester inserted into center comes out clean, 25–30minutes.
Let cool 5 minutes in pan before serving.
DO AHEAD: Muffins can be made 1 day ahead.Store airtight at room temperature.