Line an 8×8 pan with parchment paper leaving an overhang. In a large saucepan, heat milk and 1/4 teaspoon salt to a boil. Sprinkle in grits, whisking constantly. Reduce heat to medium, and whisk until thick, about 5-10 minutes. Pull the pan off heat & whisk in cheese. Scrape grits into prepared pan; set aside to cool, 10 minutes or more. Pull out parchment paper and slice grits into four squares. Heat nonstick skillet over medium heat. Add a little oil. Working in batches, crisp the squares.