Mix egg whites, coconut oil, and Greek yogurt until smooth.
Add remaining ingredients, and mix well.
Spoon into 4 large silicone muffin cups, and place on a baking sheet.
Bake for about 24 minutes, and check to see if they are done (if they are firm and a toothpick comes out clean). If not, check every 1-2 minutes.
Let cool, and enjoy! These can stay out for several hours or overnight. For longer periods, store in the refrigerator.
Notes
A note about substitutions: I would not recommend whey or other protein substitutions in this recipe. If you want to use regular coconut oil (the kind that solidifies when cold), melt it, and make sure your other ingredients are at room temperature so it doesn't solidify.