Prepare the pasta to package directions in salted water. Drain and set aside.
Preheat oven to 400 F.
Fry the ground beef, garlic and onions. Set aside when browned in a pot.
Fry up the green peppers and mushrooms. Combine in pot when done.
Fry up the pepperoni and set aside.
Add the tomato sauce, herbs, chicken stock and pepper flakes. Set pot to simmer.
Put pasta in casserole tray (ones used for lasagna.) Add cheese on top of pasta and mix.
When sauce is ready, little by little, ladle some sauce to mix into the pasta. Pasta should be somewhat covered in sauce.
Add cheese all around, then add more sauce.
Add the pepperoni on top, moistened a bit with the sauce. Add the final cheese mix after.
Bake for 30 minutes until cheese is golden brown.
Serve. Makes a very filling dish with about 8-10 servings.