Preheat oven to 425F. Slice sausage into 1 inch thick slices on a diagonal. Slice peppers into thin strips, slice yellow onion into thin slices, and cut cherry tomatoes in half.
Pour all ingredients into a mixing bowl. Mix tomato paste, balsamic vinegar, olive oil, salt, pepper, oregano, and garlic powder in a small bowl. Pour over other ingredients and toss to combine.
Spread into an even layer on a greased sheet pan - for this recipe I prefer not to use parchment paper to help the ingredients crisp a little. Bake at 425F for 30 minutes - toss once halfway through.
If you want to brown the ingredients slightly, increase the heat to a broil and broil for 2-3 minutes before removing from the oven.
Top with grated parmesan cheese and fresh basil or oregano. Serve on its on or over pasta or in rolls.
