Preheat the oven to 325 degrees F. Line a regular-size cupcake pan with 18 cupcake liners.
together the flour, baking powder, salt, and sugar. In the bowl of an electric stand mixer with a paddle attachment, add the sifted dry ingredients and mix on low speed for 30 seconds. Slowly add the oil to the mixture until fine crumbs are formed. Add the eggs
, milk, raspberry
extract, and pureed raspberries and mix on low speed for 1 minute. Stop and scrape the bowl and paddle, and then mix on medium speed for 2 minutes.
Fill the cupcake liners three-quarters full with batter
and bake until baked through, about 20 minutes. Do not open the oven during this time. Cool cupcakes completely after baking.
Put the Champagne Buttercream Frosting
into a pastry bag
and cut 1/2-inch off the tip. Frost each cupcake in a circular motion until the top of the cupcake is completely covered and serve.