These cornbread loaves were baked in a pan with two turkey molds ($36, amazon.com).
Preheat oven to 350 degrees. Coat two 5-cup turkey-shaped pans with cooking spray. Melt 1/2 cup butter and let cool.
Melt remaining 2 tablespoons butter in a skillet over medium-high. Cook corn, jalapeno, and shallots, stirring occasionally, until soft, 4 to 6 minutes.
Whisk together flour, cornmeal, salt, pepper, sugar, baking powder, and baking soda in a large bowl. Make a well in the center of the mixture and add eggs; whisk eggs into flour mixture.
Whisk together melted butter and buttermilk; stir into flour mixture, along with corn mixture and cheddar. Mix until well combined.
Divide the batter evenly between prepared pans; smooth tops. Transfer to oven and bake, rotating pans halfway through, until a cake tester inserted into the centers comes out clean, 30 to 35 minutes. Let cool slightly before inverting onto a wire rack. Serve warm or at room temperature.