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1
Preheat oven to 375 degrees F (190 degrees C).
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2
Heat a large skillet over high heat; add butter, beef cubes, sweet potato, carrots, red potatoes, and yellow onion to the hot skillet. Sprinkle meat and vegetables with 1/2 teaspoon garlic powder and black pepper. Cook and stir until meat is browned on all sides, about 10 minutes. Transfer meat and vegetables to a 1-quart baking dish.
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3
Whisk beer, brown gravy mix, 1/2 teaspoon garlic powder, thyme, and black pepper together in a saucepan over medium heat. Bring to a simmer, reduce heat to low, and cook, whisking constantly, until sauce has thickened, about 5 minutes. Pour sauce over meat and vegetables.
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4
Trim puff pastry to fit top of baking dish and cover dish with pastry.
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5
Bake in the preheated oven until puff pastry is deep golden brown and filling is bubbly, 45 to 50 minutes.
