Creating Tater Tot Sausage Breakfast Casserole is simple if you follow these straightforward steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish or casserole dish.
2. Cook the Sausage: In a large skillet, cook the breakfast sausage over medium heat until browned. Break it into crumbles as it cooks. Once done, drain excess grease and set aside.
3. Layer Tater Tots: Spread the frozen tater tots evenly across the bottom of the prepared baking dish.
4. Add Sausage: Sprinkle the cooked sausage evenly over the layer of tater tots.
5. Mix the Eggs: In a large bowl, whisk together the eggs, milk, garlic powder, onion powder, salt, and pepper until well combined.
6. Add Cheese and Veggies: Stir in the shredded cheddar and mozzarella cheese, along with any optional diced bell peppers and green onions.
7. Combine Mixtures: Pour the egg and cheese mixture evenly over the sausage and tater tots in the baking dish.
8. Bake: Place in the preheated oven and bake for 45 minutes, or until the eggs are set and the top is golden brown.
9. Cool: Remove the casserole from the oven and let it cool for about 10 minutes before slicing.
10. Serve: Cut into squares and serve warm!

These clear and concise steps will guide you in creating an amazing Tater Tot Sausage Breakfast Casserole effortlessly.