Creating Cheesy Potato and Egg Casserole is simple if you follow these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Potatoes: Boil diced potatoes in salted water until tender, about 10 minutes. Drain and set aside.
3. Sauté Vegetables: In a skillet, heat olive oil over medium heat. Add diced onions and bell peppers, cooking until soft, about 5-7 minutes.
4. Mix Eggs: In a large mixing bowl, whisk together the eggs, milk, salt, black pepper, and garlic powder until fully combined.
5. Combine Ingredients: Fold in the boiled potatoes, sautéed vegetables, and shredded cheddar cheese into the egg mixture. If you're adding cooked sausage or ham, now’s the time to include it!
6. Transfer to Baking Dish: Pour the mixture into a greased 9×13-inch baking dish, spreading it evenly.
7. Bake: Place the dish in the preheated oven and bake for 30-35 minutes or until the eggs are fully set and the top is slightly golden.
8. Cool Before Serving: Allow the casserole to cool for about 5-10 minutes prior to slicing and serving.

By following these straightforward steps, you’ll be ready to enjoy this delicious casserole in no time!