Don't peek at the popovers while they're baking--keeping the oven door closed will help them rise.
Place a 12-cup muffin pan in oven. Preheat oven to 450°F. (Do not remove pan.)
Whisk together flour, cornmeal, and salt in a large bowl. Whisk together milk and eggs in a medium bowl. Gradually whisk milk mixture into flour mixture until well blended.
Remove muffin pan from oven. Spoon 1 teaspoon melted butter into each cup of hot muffin pan; return muffin pan to oven for 2 minutes.
Remove muffin pan. Divide batter among prepared muffin cups. Bake until puffed and golden brown, 18 to 20 minutes. (Centers will be moist.) Serve immediately.
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