Preheat the oven to 350°F / 175°C. Line a muffin tin with 6 parchment liners.
To a medium sized mixing bowl, add the flour, baking powder, salt, sugar, and butter. Use a hand mixer or a stand mixer fitted with the paddle attachment to beat the mixture together until the butter has completely combined with the dry ingredients and only tiny clumps remain.
Add in the vegetable oil, egg white, sour cream, milk, pink champagne and vanilla. Beat just until combined.
Distribute the batter evenly between the six liners. Bake for 15-20 min., or until a toothpick inserted in the center of the cupcakes comes out clean.
Use a toothpick to poke many small holes into the top of each cupcake. Then, use a pastry brush to brush more pink champagne over each of the cupcakes. Set aside to cool.
Strawberry Champagne Buttercream
With a hand mixer or a stand mixer fitted with the paddle attachment, beat together the butter, salt and crushed freeze-dried strawberries until light and fluffy (~2 min.)
Add half of the powdered sugar to the frosting and beat until combined, then repeat with the remaining half.
Add in the champagne and beat for an additional minute.
Once the cupcakes have completely cooled to room temperature, generously frost each cupcake with the strawberry champagne frosting. Garnish with a strawberry, then serve and enjoy!