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1
To prepare French Onions: combine onion, butter, and sugar in a large skillet over medium-high heat.
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2
Cook, stirring often, until onion is lightly browned, about 12-15 minutes.
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3
Add flour and mix well.
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4
Remove pan from heat; gradually stir in milk and broth.
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5
Cook, stirring constantly, over high heat until boiling.
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6
Continue to cook until most of the liquid has evaporated, about 4-5 minutes.
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7
Remove from heat and stir in cheeses until melted.
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8
Season to taste with salt and pepper.
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9
Use right away; to make up to 1 day in advance, cool mixture.
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10
Cover and chill.
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11
Reheat in microwave just before using.
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12
To prepare steak: rinse steak and pat dry.
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13
Rub salt, pepper, onion flakes, and garlic flakes evenly over surface.
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14
Heat olive oil in an 8-10 inch ovenproof nonstick skillet over high heat; tilt pan to coat bottom.
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15
Add steak and brown on both sides, about 2 minutes each side.
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16
Using tongs to hold steak, lightly brown edges of steak in pan, about 2 minutes total.
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17
Wipe fat from pan with paper towels as it accumulates.
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18
Place pan with steak in 400* F oven and bake until meat is done to taste (cut to test), about 8-12 minutes for rare or about 25 minutes for well-done.
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19
Turn oven to broil.
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20
Remove pan; wipe out accumulated fat with paper towels.
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21
Top steak with French Onions and sprinkle cheese over all.
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22
Broil in pan about 6 inches from heat until cheese is bubbly and starting to brown, about 3-4 minutes.
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23
Remove pan from oven, pour broth into pan, and gently scrape up browned bits from bottom of pan.
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24
To serve, divide steak and onions into four equal portions.
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25
Set each on a rimmed plate and spoon broth around meat, stirring to release browned bits in pan.
