https://www.simplyrecipes.com/recipes/three_sisters_casserole_with_cornbread_topping/
Ingredients
For the filling:

3 tablespoons extra virgin olive oil
1 yellow onion, diced (about 1 cup)
4 cloves garlic, minced
1 pound butternut or kabocha squash, peeled and cut into 1-inch cubes (about 2 cups)
1 (15-ounce) can diced fire-roasted tomatoes
2 tablespoons tomato paste
1 teaspoon ground coriander
1 1/2 teaspoons ground cumin
1/2 teaspoon chili powder
1/4 teaspoon smoked paprika
1/2 teaspoon kosher salt
3/4 cup vegetable broth
1 cup fresh or frozen corn kernels
1 (15-ounce) can kidney beans, rinsed and drained
2 cups chopped greens (such as spinach or kale)
For the cornbread topping:

1 1/4 cups yellow cornmeal
1/2 cup all-purpose flour (or your favorite all-purpose gluten-free flour blend)
2 teaspoons baking powder
1 teaspoon kosher salt
2 tablespoons unsalted butter, melted
1/2 cup whole milk
1/2 cup water