Remove the casings from the chicken sausages. Slice in half lengthwise, then crosswise into half-moons. Heat 1 tablespoon olive oil in a large saute pan and saute chicken sausage until well browned, about 5 minutes. Remove from the pan.
Heat remaining oil in the same pan. Saute onion, mushrooms, thyme, paprika, salt, cayenne, and pepper until mushrooms are well browned, about 5 minutes. Remove from heat.
Heat chicken stock in a large stockpot. Add cannellini beans, tomatoes, spinach, and quinoa. Simmer until quinoa is tender, about 15 minutes. Add the sausage and mushroom mixture. Simmer until heated through, about 5 minutes. Serve in soup bowls.
