Heat a large skillet over medium-high heat and add 1 tablespoon olive oil.
Add the sliced sausages, red and yellow bell peppers, and 1 tablespoon Italian seasoning to the skillet.
Sauté for about 3–4 minutes, stirring occasionally, until the peppers are tender and the sausage is warmed through.
Pour in the 24-ounce jar of roasted garlic tomato sauce, then add the cooked orzo and the spinach.
Stir to combine and heat until the sauce begins to simmer and the spinach wilts, about 2–3 minutes.
Serve immediately, topping each portion with freshly grated Parmesan.
