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Preheat your oven to 400F and grease a 9x13 pan. Set aside.
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In a large pan, brown ground beef. Add diced onions to browned ground beef and sauté for 5 min or until onions are translucent.
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In a bowl, whisk together milk and cornstarch.
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Add cornstarch and milk mixture to hot pan of ground beef and onions. Stir continuously for 3-4 min or until mixture is thickened.
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Remove pan from heat and stir in Worcestershire sauce, drained green beans, shredded cheese, and salt and pepper.
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Pour mixture into greased 9x13 pan. Top with frozen tater tots.
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Bake for 20-25 min or until casserole is bubbling and tater tots are golden brown. Allow to cool for 15 minutes and serve.