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Preheat oven to 450F. Put butter in a 9x9-inch baking pan and place in oven to melt (it's fine to do this while oven is preheating).
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Mix Bisquick, sour cream, and 7Up together in a mixing bowl, being careful not to overwork the dough.
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Remove baking pan from oven when butter is melted. Careful pat the dough into the pan, making sure to cover the entire surface. Use a sharp knife to cut into 9 squares.
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Bake for 12-15 minutes or until golden brown.