Cornmeal Muffins

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Source: Cook's Illustrated

2 c all purpose flour or cake & pastry flour
1 c fine-ground whole-grain yellow cornmeal
1 1/2 tsp baking powder
1 tsp baking soda
1/2 tsp salt
2 large eggs
3/4 c sugar
1/4 c butter, melted
3/4 c sour cream
1/2 c milk