Add the olive oil and chicken sausage to a large pot and cook over medium-low heat until golden brown on the outside and slightly firm (about 5 minutes). Remove the sausage to a cutting board and slice them into rounds. Return the chicken sausage slices to the pot.
Continue to sauté the sausage until fully browned. While the sausage is cooking, dice the onion and mince the garlic. Add the onions and garlic to the pot and continue to sauté until the onions are soft and transparent. The moisture from the onions should dissolve any browned bits of sausage from the bottom of the pot.
Once the onions are soft, add the can of crushed tomatoes, dried basil, oregano, red pepper flakes, and a healthy dose of freshly cracked pepper. Stir to combine.
Empty the two cans of Great Northern beans into a colander and rinse with cool water. Let the excess water drain away, then add the beans to the pot along with the frozen chopped spinach (no need to thaw). Stir the contents of the pot and allow them to heat through, stirring occasionally (about 10 minutes).
Taste and add salt if needed. If a thicker mixture is desired, let the pot simmer longer until the sauce has reduced. Top with fresh parmesan and serve with hot crusty bread for dipping, if you have some.
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