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Preheat oven to 375° and lightly grease 12 muffin cups.
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Sauté onion in butter until soft.
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In a bowl, combine flour, baking powder, salt, pepper, and garlic powder.
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In another bowl, combine eggs, milk, and mustard. Add the sautéed onion, ham and cheese.
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Stir the wet mixture into the dry mixture just until moistened, don’t over stir!
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Spoon batter into prepared muffin pans and bake in preheated oven for 25-30 minutes.