Preheat your oven to 375°F (190°C) and grease a 9x13-inch baking dish.
Spread the frozen tater tots evenly in the bottom of the baking dish.
Sprinkle the crumbled breakfast sausage, shredded cheddar cheese, and diced bell peppers, over the tater tots.
In a separate bowl, whisk together the eggs, milk, salt, and black pepper until well combined.
Pour the egg mixture evenly over the tater tot mixture in the baking dish.
Gently press down on the ingredients to ensure the tater tots are submerged in the egg mixture.
Bake the casserole in the preheated oven for about 45-50 minutes, or until the center is set and the top is golden brown.
Once out of the oven, let the casserole rest for a few minutes before slicing.
Serve warm and enjoy!