This cozy casserole is a super easy solution to the question of what's for dinner. The savory mixture of sautéed onions, ground beef, and mushrooms get some added bulk with a bag of frozen mixed vegetables and cheddar cheese. The hash brown topping is crisped up with help from the broiler. 

Martha Stewart Living, December 2020


Credit: Chris Simpson

Recipe Summary

30 mins
1 hr 20 mins


Ingredient Checklist


Instructions Checklist
  • Preheat oven to 400°F. In a dry large skillet over medium-high heat, cook onion and mushrooms with 1 teaspoon salt, stirring occasionally, until mushrooms release their moisture, 6 to 8 minutes. Add 1 tablespoon oil and beef. Cook, stirring and breaking up meat, until no longer pink but not cooked through, about 3 minutes.

  • In a bowl, whisk together cornstarch, Worcestershire, and 2/3 cup water. Stir into skillet with frozen vegetables. Cook until vegetables are just thawed, about 1 minute. Season to taste; transfer to a shallow 2-quart baking dish. Top with cheese.

  • Toss potatoes with remaining 2 tablespoons oil; season generously with salt and sprinkle over beef mixture. Bake until bubbly, about 40 minutes. Switch oven to broiler; broil until potatoes are golden brown in spots, about 5 minutes. Let cool 10 minutes; serve.



Rating: 5.0 stars
My entire family loved this recipe! It was a quick and easy weeknight dinner. I had leftover beef broth on hand and used that to mix with the cornstarch instead of water. Will definitely make again!