Preheat the oven to 375°F (190°C).
Lightly grease a 9-inch deep-dish pie pan or oven-safe skillet with olive oil.
Place two flour tortillas in the bottom of the pan, overlapping slightly to cover the entire base. Press gently to fit the pan shape.
Layer the cooked turkey sausage evenly over the tortillas.
In a medium bowl, whisk together the eggs, whole milk, salt, and black pepper until well combined.
Add the diced green bell pepper, red bell pepper, and yellow onion to the egg mixture and stir to combine.
Pour the egg and vegetable mixture evenly over the sausage layer in the pan.
Sprinkle the shredded cheddar and mozzarella cheeses evenly over the top.
Place the remaining two tortillas on top, overlapping as needed to cover the filling, creating a tortilla ‘lid’.
Brush the top tortillas lightly with olive oil to help crisp them during baking.
Bake in the preheated oven for 20 to 25 minutes, or until the eggs are fully set and the top tortillas are golden brown and crispy.
Remove the pizza from the oven and let it rest for 5 minutes.
Sprinkle chopped fresh parsley over the top before slicing and serving.