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Turn on the broiler. Heat oil in a 12-inch skillet over medium heat. Add onion.
Add the beef to the skillet and raise the heat to high. Cook, turning and breaking up the meat until it is crumbled and browned and the onion is tender. (About 5 minutes) While the meat is browning, stir in the ketchup, Worcestershire, and garlic.
Stir in the peas and reduce the heat to medium-low and let simmer.
Meanwhile, combine the bouillon cube and water in a 1-cup glass measure. Microwave 1 minute, uncovered, on high, to dissolve the cube. Stir the cornstarch briskly into the bouillon until well blended. Pour the cornstarch mixture into the skillet and stir well. Continue to simmer, stirring occasionally.
Meanwhile, microwave the potatoes according to package directions, adding the butter. While the potatoes warm, stir the sour cream into the thickened beef mixture.
NOTE: At this point, transfer meat mixture to a 9-inch square casserole dish unless your skillet can withstand broiling.
Spoon the potatoes over the beef mixture, spreading to within 1-inch of the sides of the pan. Sprinkle the cheese over the potatoes and broil until the cheese is melted and bubbly. (About 2 minutes) Serve at once.
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