Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper or a silicone baking mat.
In a medium bowl, whisk together the 4 eggs, mozzarella, parmesan, garlic powder, salt, and pepper until well combined.
Spread the egg and cheese mixture onto the prepared baking sheet, forming a circular shape for your pizza base.
Bake the base in the preheated oven for 15 minutes, or until it's set and beginning to turn golden brown.
While the base is cooking, fry the chopped bacon in a pan over medium heat until crisp. Drain on paper towels and set aside.
In a small bowl, mix the heavy cream with the egg yolk and Pecorino Romano cheese.
Once the base is cooked, remove it from the oven and spread the cream mixture evenly over the top, leaving a small border around the edge.
Sprinkle the cooked bacon pieces over the cream mixture.
Return the pizza to the oven and bake for an additional 5 minutes, or until the topping is warmed through and slightly set.
Remove from the oven, garnish with chopped parsley and a generous amount of black pepper.
Slice and serve warm.