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Preheat oven to 350 degrees.
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Lightly spoon flour into dry measuring cups and level with a knife.
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Combine flour, baking powder and salt in a medium bowl, stirring with a whisk.
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Cut in butter with a pastry blender or 2 knives until mixture resembles coarse meal.
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Add sour cream, cheddar (or Mexican) cheese, 1 tablespoon water and egg.
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Stir until just moist.
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Knead in bowl with lightly floured hands just until dough forms.
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Divide dough in half.
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Shape each half into a 6-inch circle on a baking sheet coated with cooking spray.
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Cut each circle into 6 wedges 1 inch apart on pan.
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Bake at 350 degrees for 20 minutes or until browned.
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Serve warm.