Butter Biscuits for High Altitude

This recipe has been adapted for high altitude from the country cook. They have a bunch of great recipes on their blog.
Ingredients:

3 3/4 ounces butter
2 3/4 cups all-purpose flour
4 teaspoons granulated sugar
2 1/2 teaspoons baking powder
2 1/4 Cups Buttermilk Directions:

Preheat oven to 450F
Grease and 8X8" glass baking dish. Add your butter, and melt it in the microwave.
Mix all dry ingredients in a bowl. Then add the buttermilk. It will be a very sticky dough.
Add the dough to the butter dish and spread evenly. Then using a sharp knife cut into 9 squares (Two slices each direction will do it).
Put glass baking dish on a baking sheet, to catch any spilled butter, and bake for 23-25 minutes. They will be golden on top.