In a bowl, whisk oats, flour, brown sugar, spices, and salt together. Add in the cold butter cubes and use your fingers or a pastry cutter to rub it in until you achieve pea-sized pieces.
In a bowl, whisk oats, flour, brown sugar, spices, and salt together. Add in the cold butter cubes and use your fingers or a pastry cutter to rub it in until you achieve pea-sized pieces.