Slice and puree your strawberries. You can puree them in a food processor.
Use the frosting tip to cut out the center of each cupcake, then fill with sprinkles, and put the top of the center that you took out back into the cupcake, gently pushing down on it.
Add the butter and pureed strawberries to the bowl of a mixer (or medium bowl), and beat on high until creamy.
Add half the powdered sugar and mix in on low, then switch to medium. Repeat for the remainder of the powdered sugar, switching to high at the end.
Add frosting to a piping bag equipped with the tip that you used in step 2, and pipe frosting onto the cupcakes in a circular motion, starting from one side, around the cupcake and meeting the end, then moving into the center and stopping.
Gently push a sliced strawberry onto the top of the frosted cupcake.