In a Dutch oven, heat olive oil over medium heat.
Add turkey sausage, onion, salt, and pepper.
Cook, breaking up sausage with a wooden spoon and stirring occasionally, until onion is softened and sausage is browned, 5 to 7 minutes.
Add cabbage and garlic to pan; stir to combine.
Cook, stirring occasionally, until garlic is fragrant, about 5 minutes.
Add tomatoes and puree, crushing tomatoes with your hands as you add them.
Stir in chicken stock. Bring to a simmer; cover, and cook until cabbage is tender, about 15 minutes.
Stir in white beans; simmer, uncovered, 5 minutes.
Top servings with Whole Wheat Croutons and parsley.