This may sound silly but I think it will show you another option of eating a cupcake. This 'Nut & Party' cup from Wilton was really new to me. The first time I tried eating the cake out of it I used a teaspoon to dig in. I actually found out the cup can be opened this way after my kids did it ;p
Step 1: Just pull between 2 folds at the edge one by one as shown.
Step 2: The cup will open without affecting the shape of the cake. This one a bit messy because it's chocolate fudge.
Step 3: Hold the cake at the side and bite into it :o) If you only want part of it, use a knife and cut it into half or quarters.