1. Chop 1/2 cup cold butter into small chunks. In a medium sized mixing bowl combine 1 cup flour, 1/2 cup old fashioned oats, 1/2 cup brown sugar, 1/2 tsp cinnamon, 1/4 tsp salt, stir to combine. Crumble chopped butter into the rest of the ingredients, working it until the butter is in small pea sized chunks.