This one comes from my grandmother, super simple, but so good. Cake mixes have been downsized in the years since she's made them, so the yield will be less, but the flavor is all still there.
Gram O'Leary's Lemon Cupcakes
1 package lemon cake mix -- plus ingredients to make cake
1 package lemon pie filling -- plus ingredients to make filling
powdered sugar -- for dusting
pie filling per box directions up to 1 day ahead. Prepare lemon cake
mix according to directions, fill 12 lined muffin cups. Bake according
to package time. Allow cupcakes to cool. Using knife, cut cone shape out
of top of each cupcake (like making a lid on a jack o lantern). Spoon
pie filling into each hole, replace lid. Dust with powdered sugar.