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Heat oven to 350°F.
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Coat 9 x 9-inch or 7 x 11-inch baking dish with non-stick spray.
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Combine flour and seasoning in shallow bowl or plate.
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Heat oil in large skillet over medium-high heat 4 or 5 minutes.
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Dredge meat in flour mixture.
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Brown meat in skillet about 5 minutes per side; then transfer beef to prepared baking dish. (Reserve leftover flour mixture.)
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Leave 2 tablespoon pan drippings in skillet or add additional oil if needed. Add reserved flour mixture and brown over medium heat; stir and loosen any browned bits left in bottom of pan. Stir in milk slowly; heat to a simmer.
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Pour gravy into baking dish over steak. Top with potatoes; spread them edge to edge.
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Bake 30 minutes; top with fried onion and bake 10 more minutes.