Preheat: Set your oven to 350°F (175°C). Grease a muffin tin with cooking spray or line with paper liners.
Mix Wet: In a medium bowl, whisk together the milk, melted butter (or oil), egg, and cayenne until just combined.
Mix Dry: Add the flour, baking powder, sugar, and salt to the wet ingredients. Stir until a batter forms, being careful not to overmix.
Fold: Gently fold in the 1 cup of shredded cheddar cheese.
Scoop: Spoon the batter into the muffin tin, filling each cup about ⅔ full. Sprinkle a little extra cheese on top of each if desired.
Bake: Bake for 20–25 minutes. The muffins are done when they are firm to the touch and a toothpick inserted into the center comes out clean.