Preheat oven to 375 degrees. Grease a casserole dish with spray butter.
Brown ground beef on medium heat in a large skillet. While the beef is cooking, chop or puree the mushrooms. When the beef has browned, drain in a strainer.
While the meat is draining, coat the skillet with oil or butter. Saute the mushrooms for 4 to 5 minutes.
Add the meat back to the skillet with the mushrooms. Stir and warm the meat mixture with the salt & pepper, onion powder, garlic powder, and Worcestershire sauce for 2 to 3 minutes. Turn off the burner and set aside.
In a bowl, mix the canned soup and the milk until lumps are gone.
Add the soup mixture and the frozen peas to the skillet and stir into the meat mixture.
Pour the meat and soup mixture into the casserole dish and spread out evenly.
Sprinkle cheddar cheese evenly on top of the meat. Then lay the frozen tater tots on top.
Bake uncovered for 30 to 40 minutes or until the soup is bubbling and the tater tots are crispy and golden brown.