Do ahead: Wrap sweet potato in heavy foil and roast 1.5 hours at 425F in oven or toaster oven. Once it can easily be pierced with fork, it's done. Carefully unwrap (it's hot!) and let cool enough to handle. Gently peel off skin and mash sweet potato. Measure out 1.5 cups for use in this recipe.
Spray 10.25" cast iron skillet with oil and set in oven on lower middle rack. Preheat oven to 425F.
In a large bowl, whisk together the cornmeal, dry creamy wheat, flour, sugar, baking powder, cinnamon, nutmeg, and salt. In a separate bowl, combine mashed roasted sweet potato, eggs, yogurt, milk, and olive oil. Whisk to combine well. Mixture should be smooth and thick.
Using a rubber spatula, gently fold sweet potato mixture with the cornmeal mixture just until no dry streaks of flour remain. Do not over-mix.
Place preheated/greased skillet on a heat-safe surface. Scrape batter into skillet, evening out the top into the edges. Bake 25-30 minutes or until top is puffy and golden brown. There should be cracks visible around edges of cornbread. Place cornbread on wire rack. Immediately place 4-5 pats of butter on top, letting butter melt into the cornbread.
Slice and serve with additional butter, if desired. Cornbread is best when served hot and fresh, while top is slightly crisp and butter has just melted into it!
2 medium-sized sweet potatoes yields approximately 1.5 cups mashed.
Cream of Wheat provides a toothsome texture and a boost of nutrition to this cornbread. It's also finer and bakes up a bit more tender than straight cornmeal. However, you can sub with more cornmeal instead if you'd like.
If you use a 12" cast iron skillet, decrease bake time by 5-10 minutes; follow recipe instructions to watch for doneness.
Cook time does not include pre-roasting of sweet potatoes; please plan on roasting sweet potatoes ahead of time (can be done up to 2 days ahead.)
Do not leave leftover cornbread in the cast iron skillet, as it will take on an iron hue and flavor. Rather, serve the cornbread immediately and quickly transfer extra slices into a separate container.
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