Heat a large dutch oven over medium heat. Add sausage and cook for 3-5 minutes, until the sausage starts to cook through.
Add white onion to the dutch oven. When the white onion begins to turn translucent, add garlic, mushrooms, red pepper flakes, Italian seasoning, salt and pepper. Cook for 5 minutes, stirring frequently.
Add stock and orzo to the dutch oven. Stir well, then cover and cook for 12 minutes, or until all liquid is absorbed. Open lid occasionally and stir any orzo stuck to the bottom of the Dutch oven.
Add spinach and stir until wilted.
Serve with drizzled extra virgin olive oil and fresh basil.
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