French Onion Shepherd's Pie
Ingredients:
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5 medium potatoes, peeled and cubed
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1 cup shredded Cheddar cheese, divided
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⅛ cup milk
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1 green onion, chopped
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1 tablespoon salted butter
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1 pound ground beef
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2 tablespoons all-purpose flour
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¼ teaspoon ground black pepper, or more to taste
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1 (10.5 ounce) can condensed French onion soup
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¼ cup water
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1 cup frozen peas