First, preheat the oven to 375 F. Then, line each ramekin with two slices of prosciutto, making sure to cover as much of the bottom and sides as possible. The prosciutto will fold over the sides of the ramekin.
Crack one egg into the ramekin and add 1 tablespoon skim milk. (No need to stir) Top with 1 tablespoon Gruyere and ground pepper to taste. Repeat for the second ramekin then place them both on a parchment lined baking sheet and pop them in your oven. Bake for 14 minutes.