01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or lightly grease each cup.
02 - In a large mixing bowl, thoroughly whisk together the all-purpose flour, cornmeal, baking powder, baking soda, and salt.
03 - In a separate bowl, whisk the eggs, whole milk, melted and cooled butter, and mashed sweet potato until homogenous.
04 - Pour the wet mixture into the dry ingredients and gently stir until just combined; avoid overmixing to preserve tenderness.
05 - Carefully fold the shredded cheddar cheese and chopped jalapeños into the batter until evenly distributed.
06 - Divide the batter uniformly among the prepared muffin cups.
07 - Bake for 22 to 25 minutes, or until a toothpick inserted in the center of a muffin emerges clean.
08 - Let muffins cool in the tin for 5 minutes, then transfer to a wire rack to cool completely before serving.