Taco Turnovers

1 T. yeast
3 T. sugar
1 1/2 c. water
3+ c. flour
3 T. oil
1 tsp. salt
1 lb. hamburger
1 pkg. taco seasoning mix (mix according to package instructions)
1 lb. cheese

Mix first 6 ingredients. Divide into twelve balls. Roll into 5"-6" circles. Mix meat and taco mix together. Fill circles with meat and cheese. Fold over and crimp closed. Bake at 375 until golden brown.