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Preheat oven to 500 degrees F.
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Put 1 Tbsp butter in a large cast iron skillet, or heavy baking dish, and place in oven.
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In a large bowl, combine flour, baking powder, 3/4 cup of the cheese, and salt, mix till combined.
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Cut butter in using a pastry cutter or two knives (I use my kitchen-aid, more often than not, with a paddle beater), until it is the consistency of small peas.
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Stir in buttermilk, if too dry or crumbly, add at few splashes more until the dough is workable, but not sticky.
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Take skillet out of the oven.
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On a floured surface, turn dough out, knead no more than 8-10 times, and pat down to about 3/4" thickness. Cut out biscuits with a biscuit cutter or a kitchen glass. Don't bother re-rolling the dough, just leave the odds and ends in the pan as they are as a little treat for yourself. Just to ensure the biscuits aren't tough!
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Prick with the tines of a fork, and brush with beaten egg over the tops.
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Sprinkle with the remaining 1/4 cup of cheese, place in hot skillet.
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Bake 10-12 minutes till golden brown and cheese is bubbly and slightly browned.