French Onion Shepherd's Pie

Ingredients (11 items)

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