Bacon Cheddar Biscuits with Maple Chile Butter


16¼ ounce all-purpose flour
¼ cup granulated sugar
2 tablespoon baking powder
½ teaspoon baking soda
½ teaspoon kosher salt
1 pinch ground nutmeg
6 ounce frozen unsalted butter
1 pound crispy, cooked bacon (chopped into bits)
4 ounce grated Gruyère cheese
6 ounce grated cheddar cheese
1 cup chilled buttermilk
1 egg yolk mixed with 1 teaspoon water (as egg wash)
freshly cracked black pepper
½ cup unsalted butter (at room temperature)
1/8 teaspoon arbol chile powder
½ teaspoon maple syrup