"If you don't have (or can't spare) a cast-iron skillet, sauté the apples and onions in any heavy skillet and transfer to a buttered 8x8" glass dish for baking...."
INGREDIENTS
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3/4 cup plus 2 tablespoons unsalted butter
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1 medium onion, thinly sliced
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1 teaspoon kosher salt plus more
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Freshly ground black pepper
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2 medium red- or pink-skinned apples (such as Pink Lady), thinly sliced
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5 tablespoons sugar, divided
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3 teaspoons fresh thyme leaves, divided
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1 1/2 cups cornmeal
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1 cup all-purpose flour
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1 tablespoon baking powder
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2 large eggs
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1 1/2 cups buttermilk