Making Breakfast Bliss Casserole is straightforward with these clear steps:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C). Grease a large baking dish for easy cleanup.

2. Cook the Sausage: In a skillet over medium heat, brown the breakfast sausage until fully cooked. Break it into crumbles as it cooks. Once done, set aside.

3. Prepare Vegetables: In the same skillet, sauté the bell pepper and onion until softened, about 5-7 minutes. If using spinach, add it in the last 2 minutes for wilting.

4. Beat Eggs: In a large mixing bowl, whisk together the eggs, milk, salt, pepper, and garlic powder. Ensure it is well combined.

5. Combine Ingredients: In the greased baking dish, layer the cubed bread, followed by the cooked sausage, sautéed vegetables, and a generous sprinkle of cheese.

6. Pour Egg Mixture: Carefully pour the egg mixture over the layered ingredients in the baking dish, ensuring everything is evenly soaked.

7. Top with Cheese: If desired, sprinkle any remaining cheese over the top for a beautifully melted finish.

8. Bake: Place the casserole in the oven and bake for about 40-45 minutes, or until the egg is set and the top is lightly golden.

9. Cool Slightly: Once baked, let the casserole cool for about 5-10 minutes to help it set further for easier slicing.

10. Slice and Serve: Cut into squares or rectangles and serve warm.

Each step of these instructions will guide you to create a delicious Breakfast Bliss Casserole that your family and friends will love!