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1
Mix flour, butter, sugar, yeast, and salt together in a large bowl; pour in warm water.
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2
Stir mixture into a soft ball.
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3
Roll dough out on a floured surface; knead until dough is elastic, 3 to 4 minutes.
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4
Place dough in a bowl and cover with a towel; allow to rise in a warm and dry area, about 1 hour.
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5
Preheat oven to 350 degrees F (175 degrees C).
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6
Heat a large skillet over medium-high heat.
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7
Cook and stir beef and onion in the hot skillet until beef is browned and crumbly, 5 to 10 minutes; drain and discard grease.
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8
Add cabbage; cook until cabbage is steamed and wilted, about 10 minutes.
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9
Season with garlic powder, salt, and pepper.
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10
Split dough in half.
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11
Roll each piece to fit an 8x8-inch baking dish.
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12
Press one of the crusts into the bottom and up the sides of the baking dish.
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13
Spoon hamburger mixture into crust; cover with cheese slices.
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14
Cover cheese layer with second crust; pinch edges of both crust together to seal.
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15
Bake in the preheated oven until lightly browned, about 20 minutes.
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16
Cover casserole with aluminum foil and bake until filling is hot, about 10 minutes more.
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17
Allow to sit for about 5 minutes before cutting.
