Oat-and-Cheddar Crackers

Ingridients of Oat-and-Cheddar Crackers:

• 1/2  cup old-fashioned rolled oats
• 1/4  cup milk
• 3/4  cup all-purpose flour
• 1/4  teaspoon baking powder
• 1/4  teaspoon salt
• 4  ounces sharp cheddar cheese (1 1/4 cups), shredded
• 2  tablespoons cold unsalted butter, cut into small pieces
• 1  large egg, lightly beaten
• 1  large egg yolk lightly beaten with 1 tablespoon of milk
•   Demerara or Turbinado sugar