To make this in the crockpot add everything except for the polenta (the chicken, enchilada sauce, spices, peppers and onions) right into the crockpot bowl. Add 1 cup of chicken broth and cook on high for 4 hours or on low for 6-8 hours. Shred the chicken and cook the polenta. Assemble as directed. To make this a vegetarian meal try swapping the chicken for lentils or chickpeas.