Preheat oven to 375.
Slice peppers and onions into strips (like fajita style).
In a 9×13 pan, mix peppers, onions, garlic, olive oil, salt, pepper and oregano together.
Cut sausage links into pieces. I do bigger than bite size, but if you did smaller, it would shorten your baking time. It depends on how you're going to serve it.
Put sausages onto of the veggies.
Bake for about 40 minutes until vegetables are soft.
Add in the spaghetti sauce and stir it into the sausage, peppers and onions.
Bake for another 15 minutes. Make sure the sausages are done before serving.
Boil your pasta if you're going to serve it over spaghetti. Or prepare your hoagie buns if you're making sandwiche.
Serve!