Polenta Lasagna

1 (26 ounce) jar marinara sauce, divided 1 teaspoon olive oil 1 cup chopped onion 1/2 chopped red bell pepper 1 cup ground turkey , crumbled 1 cup chopped[...]

3 tablespoons extra virgin olive oil 1 (6 ounce) bag baby spinach salt 1 (8 ounce) package sliced mushrooms, preferably cremini 2 tubes prepared polenta, 18[...]

2 cups broth 3 cups water 1 cup coarse cornmeal 1 teaspoon salt cheese (dairy or non dairy) 2 teaspoons extra virgin olive oil 12 mushrooms 2 small zucchini 2[...]