Creating this incredible Bisquick Breakfast Casserole is as simple as following these steps:

1. Preheat the Oven: Start by preheating your oven to 375°F (190°C). Grease a 9×13-inch baking dish to prevent sticking.
2. Prepare the Filling: In a large bowl, whisk together the eggs and milk until fully combined. Add in the salt, pepper, garlic powder, and onion powder, mixing well.
3. Combine Ingredients: Stir in the crumbled sausage or ham, chopped vegetables, and 1 1/2 cups of shredded cheese into the egg mixture.
4. Add Bisquick: Gradually fold in the Bisquick baking mix until everything is evenly combined. The mixture will be thick.
5. Transfer to Dish: Pour the mixture into the greased baking dish, spreading evenly.
6. Top with Cheese: Sprinkle the remaining 1/2 cup of cheese on top of the casserole for a deliciously cheesy finish.
7. Bake: Place the casserole in the preheated oven and bake for 35-40 minutes, or until the center is set and the cheese is bubbly and golden brown.
8. Cool Slightly: Once baked, allow the casserole to cool for about 5-10 minutes before slicing. This will help everything set even more.
9. Serve: Cut into squares and enjoy either warm or at room temperature.

Following these steps will ensure you create an amazing dish that will warm hearts and fill bellies!