Butternut Squash Black Bean Enchiladas with Chipotle Greek Yogurt Sauce

Name: Butternut Squash Black Bean Enchiladas with Chipotle Greek Yogurt Sauce
Ingredients: 1 ”“ 15 oz can good quality tomato sauce; 1 ”“ 7.5 oz can chipotle peppers in adobo sauce; 3/4 cup nonfat plain greek yogurt; 2 cloves garlic, minced or smashed; 1 1/2 tablespoons chili powder; ~~~~~~~~ For the enchiladas ~~~~~~~~; 1 teaspoon olive oil; ½ yellow onion, diced; 1 clove garlic, minced; 4 cups cubed butternut squash (a little over 1 pound); 1 ”“ 15 oz can black beans, rinsed and drained; 3/4 cup fresh or frozen sweet corn; Salt and pepper, to taste; 2 cups shredded reduced fat Colby jack cheese, plus more if you'd like; 12 corn tortillas; extra greek yogurt, cilantro, avocado, and green onions, for topping