Preheat the Oven: Start by preheating your oven to 350°F (175°C). This will ensure that your casserole bakes evenly.
Cook the Pasta: In a large pot, cook your pasta according to the package instructions, draining it when done and setting it aside.
Combine Ingredients: In a large mixing bowl, combine the cooked pasta, chopped vegetables, shredded cheese, cream of mushroom soup, milk, garlic powder, salt, and pepper. Mix until everything is well coated.
Prepare the Baking Dish: Lightly grease a casserole dish with cooking spray to prevent sticking.
Assemble the Casserole: Pour your pasta mixture into the prepared baking dish, spreading it out evenly. If you’d like a crispy top, sprinkle breadcrumbs over the mixture.
Bake: Place the dish in the oven and bake for about 30 minutes, or until the top is golden and the casserole is bubbly.
Serve and Enjoy: Once done, let it cool for a few minutes before diving in. Serve it hot and watch everyone savor each bite!