Old-school spaghetti

*Ingredients:

°454 grams rotini (elbow or spaghetti can be substituted)
°1/2 teaspoon kosher salt
°2 tablespoons of butter
°2 tablespoons olive oil
°1 tbsp garlic (minced from the jar)
°1 medium green bell pepper
°1 medium onion (white or yellow)
°227 grams mushrooms, sliced
°1/2 teaspoon kosher salt
°1/2 teaspoon black pepper
°A bowl with a capacity of
°1/2 liter containing 3/4 liter containing grated cheese (Mozzarella, Italian Blend or Cheddar)