**Preheat Oven:** Preheat your oven to 400°F (200°C). Place the pizza crusts on a baking sheet and brush them lightly with olive oil.
**Cook Sausage:** In a large skillet, cook the breakfast sausage over medium heat, breaking it into small crumbles, until browned and cooked through. Remove from the skillet and set aside.
**Scramble the Eggs:** In a mixing bowl, whisk together the eggs, milk, salt, and pepper. Pour the mixture into the same skillet and cook over medium-low heat, stirring gently, until the eggs are just set.
**Assemble Pizzas:** Divide the scrambled eggs evenly among the pizza crusts. Top with cooked sausage, mozzarella, and cheddar cheese. Add any optional toppings, if desired.
**Bake:** Bake in the preheated oven for 8–10 minutes, or until the cheese is melted and bubbly.
**Serve:** Remove from the oven and garnish with chopped parsley or green onions, if desired. Serve warm.