Cheddar-Thyme Flaky Biscuits

2 cups flour
4 teaspoons baking powder
3 tablespoons white sugar
1/2 teaspoon salt
1/2 teaspoon cream of tartar
1/2 cup butter or margarine
3/4 cup milk
1/2 cup shredded Cheddar cheese
1 tablespoon chopped fresh thyme
 
     Preheat the oven to 425 degrees F (220 degrees C). In a medium bowl, stir together the flour, baking powder, sugar, salt and cream of tartar. Cut in butter using a pastry cutter or a fork until it is the size of peas. Make a well in the center of the mixture and measure the milk, cheese and thyme into the bowl. Gently mix until a soft dough forms.
     Roll or pat out on a floured surface to 3/4 inch thick. Cut into circles and place on a baking sheet. Bake for 10 minutes in the preheated oven, or until the bottoms of the biscuits are golden brown.