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Preheat oven to 450 degrees F. Grease a cookie sheet.
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In a bowl, mix the Bisquick with 1/3 cup mayo and the milk until soft dough forms.
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Roll or pat the dough into a 12 x 8-inch rectangle on the cookie sheet.
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Sprinkle 2 tablespoons grated Parmesan (if using) cheese over the crust.
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Bake for 8-10 minutes or until golden brown.
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In another bowl, mix the chopped turkey, onions, bacon and 1/4 cup mayo.
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Spoon over the crust to within 1/4-inch of the edge.
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Sprinkle with tomatoes and cheese.
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Bake for 5-6 minutes, or until the turkey mixture in hot and the cheese is melted.