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In a small bowl stir together flour, 3 T yellow cornmeal, sugar, baking powder and salt.
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Make a well in the center of the dry ingredients.
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Stir together beaten egg yolk, milk and melted butter.
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Add all at once to the dry ingredients, stirring just till moistened.
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Line two 6-ounce custard cups with paper baking cups.
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Fill cups 2/3rds full.
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Sprinkle a little additional cornmeal atop muffins.
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Micro-cook, uncovered, on 100% power about 45 seconds or till done, rearranging once. (When done, the surface may appear moist but a wooden pick inserted near the center should come out clean.).