Lightly whisk together eggs, milk, salt and pepper in a bowl.
Place a non-stick skillet over medium heat, add 2 tablespoons of butter.
When butter is melted, pour in egg mixture. Using a spatula, mix eggs into butter as the eggs cook. Keep scrambling with spatula, and cook until eggs are soft and hold together, about 2-3 minutes. For best results, do not overcook eggs; they will continue cooking in the microwave.
If a crispy crust is desired, toast muffins in a conventional toaster or a toaster oven. Leave untoasted for a softer crust. Spread the remaining butter on each muffin half.
Spread each muffin half with pizza sauce. Top with cheese and pepperonis. Divide scrambled eggs and place on top of each pizza.
Place two pizza halves on a microwave-safe plate. Microwave for 30-60 seconds, or until the cheese melts.
Serve right away, or freeze for up to 3 months by placing pizzas on a baking sheet or plate that can fit into the freezer. Freeze for an hour to set ingredients in place. Remove from the freezer and wrap each pizza individually in parchment paper and place them in a freezer-safe zipper bag.
To reheat, thaw in fridge overnight. Place thawed sandwich (keep parchment paper on or replace with a paper towel) on a microwave safe plate. Heat on high for 30-60 seconds or until the sandwiches are warmed through. If taking the sandwiches directly out of the freezer, remove sandwich from bag and place on a microwave safe plate. Microwave for 60-90 seconds on defrost (or 50% power). Flip the sandwich over and microwave for 30-60 seconds on high power, until warmed through. You can also reheat the sandwiches in the oven or in the toaster oven. Cover with foil and bake at 350 degrees for about 15-20 minutes or until warmed through.