Preheat the oven to 400 degrees F. Lightly coat a 12-cup muffin tin with cooking spray.
Cut the prosciutto slices in half and overlap 2 pieces in each cup. Using a 2-inch cutter, cut 12 rounds from the bread and set one on top of the prosciutto in each cup.
Divide the pesto evenly among the cups; sprinkle the Parmesan evenly over the pesto. Crack an egg into each cup and season with salt and pepper. Bake until the egg whites are set but the yolks are still runny, 8 to 12 minutes. Serve.
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