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Coat a 9×13 inch baking dish with nonstick cooking spray.
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Mix together the ham, green onions and 2 cups of the cheese in a medium bowl. Scoop 1/3 cup of the cheese mixture onto each tortilla; roll up and place seam side down in the baking dish.
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Whisk together the half-and-half, eggs, salt, and flour. Pour liquid over tortillas. Cover and refrigerate overnight.
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In the morning, preheat oven to 350º F. Bake, covered, for 35 minutes. Remove foil and sprinkle remaining 1/2 cup of cheese over enchiladas. Bake for 10 more minutes or until tops are golden brown and the egg mixture is set.
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Serve with salsa, sour cream, and additional green onions or cilantro.