Preheat oven to 375 degrees and spray a 9 x 13 casserole dish with non-stick cooking spray.Peel and cube the squash and chop the onion.
Add about 2 Tbsp oil to a large skillet or dutch oven and heat over medium-high until hot. Add the cubed squash to the skillet, along with the salt and pepper. Saute the squash about 7-8 minutes, or until softened and lightly browned.
2-3 Tbsp olive oil, 2 cups butternut squash, about 1/2 tsp salt, about 1/4 tsp pepper
Add onion and bell peppers to skillet and saute until softened, about 3 minutes. Add sausage to pot or skillet and cook until no longer pink (about 4-5 minutes), breaking it up with the spatula to combine with the vegetables.
1 large onion, 1 1/2 cups diced sweet bell peppers, 1 lb Italian or Andouille sausage
Add the black beans, tomatoes, harissa, and spices to the skillet. Stir everything together thoroughly and cook for another 3-5 minutes.
15 oz can of black beans, 15 oz can diced tomatoes, 2 Tbsp harissa spice blend, 1 Tbsp smoked chile peppers, 1 Tbsp chipotle spice
Pour the sausage-vegetable mixture into the casserole.Sprinkle the grated cheese over the mixture in the baking dish. Prepare the cornbread batter according to the package instructions and then spread the raw batter over the casserole. The cornbread mixture will be lumpy and difficult to spread evenly. Just do your best - it's rustic!
1 box cornbread mix, 1 cup Monterey Jack cheese
Bake in a 375℉ oven for about 25 minutes or until the cornbread is golden brown. Cool slightly before cutting into squares for serving.
Video
https://youtu.be/HLAcsDNuLpc
Notes
** Note that the nutritional analysis is for the low carb version and does not include the cornbread topping.