Slice squash into rounds or half-moons (no need to peel). Steam for 8–10 minutes, until very tender. Drain well and let cool slightly.
Transfer to a sieve or colander and press gently to remove excess water. Purée until completely smooth — you should have about 1½ cups of squash purée.
Make the cornmeal base:
In a medium saucepan, heat 3 tbsp butter over medium-low until warm then turn to low, and stir in cornmeal. It will look like a thick paste. Remove from heat and stir in salt, maple syrup, baking powder, and nutmeg.
Stir the warm squash purée into the cornmeal mixture until smooth and well combined. Let cool slightly before adding the eggs.
Caramelize the apples:
In a small skillet, melt butter. Add diced apples, brown sugar, cinnamon, and salt. Cook for 5–6 minutes, stirring often, until golden and tender.
Combine and bake:
Add eggs to the warm squash-cornmeal mixture. Gently fold in caramelized apple and sprinkle cinnamon over the top.
Pour batter into a greased 9x9-inch baking dish
Bake at 350°F for 40-50 minutes, until golden and set in the center.
Keyword spoonbread recipes, squash and apple casserole, squash apple bake, squash dish