Preheat the oven to 400°F and line a 21” x 15” baking sheet with parchment paper. Cube the butter and put it in the freezer while you finish prepping the biscuit ingredients.
In a large bowl, sift together flour, sugar, salt, and baking powder.
Add the butter to the dry ingredients and mix until crumbly. Don’t overbeat; you want the butter to remain cold.
In a separate bowl, whisk together the egg and half-and-half.
Create a well in the center and pour in the wet ingredients. Fold lightly until just incorporated.
Dust your workspace with flour and dump out the batter. Shape into a rectangle, fold one side toward the center, then repeat with the other side. Don’t overwork the dough; you don’t want to melt the butter.
Use a rolling pin to roll out the dough to a 5x10” rectangle.
Use a biscuit mold to create 10 biscuits. Use the extra dough scraps to shape out the last 2 biscuits. Gently transfer the biscuits to the prepared baking sheet.
Bake for 10-15 minutes or until the biscuits are golden brown.
Once baked, remove the biscuits from the oven and brush the tops with melted butter.