Yellow cake cupcakes, made with Sprite soda, with a Reese's cup inside for my daughter (& her little dog Stella)'s homecoming party! I froze the reese's before placing them on top of the chilled batter. They were intact in shape in the middle of the cupcakes!. Someone had suggested opening the oven about 10 minutes into the baking time and inserting the candies, but I was afraid to try that. This worked great!