Bake for 10-12 minutes, or until firm and a toothpick comes out clean.
Meanwhile mix frosting ingredients until smooth.
Remove cupcakes from oven, and let cool slightly.
Remove from silicone cups.
To fill cupcakes, use a knife to 'core' the cupcake (be sure not to cut all the way through to the bottom!) and use a spoon to remove the core. (Or use a cupcake coring tool.)
Fill cupcakes with 1 teaspoon each of all-fruit spread.
Break a piece off the bottom of each core to account for the filling, and replace cupcake cores. (This is optional, otherwise the filling will get pressed into the cupcake and not look like the picture, but will still be delicious!)
Frost cupcakes, and enjoy! Store extras in the refrigerator.
Notes
A note about substitutions: because each type of protein powder has a distinct flavor and texture when baked, I would not try substituting different types of protein powders in this cupcake recipe. (See my Recipe Basics video for examples of what goes wrong when you use the wrong protein powder.) In the frosting, you can replace the whey with casein if you like. Vegan protein powders can also be used to replace the whey, but the frosting would be less creamy and more grainy. The almond meal adds a little fat and moisture to the cake; you can probably replace that with 1 tablespoon of peanut butter.