Prep your ingredients: Slice and dice Spam into small cubes, about ¼-inch size.
Mix it up: Combine diced Spam, shredded cheese, and egg in a bowl. Mix thoroughly until well combined.
Heat cooking surface: Preheat waffle maker or oven to 400°F (200°C).
Cook to crispy perfection: For waffle maker, add 3 tablespoons of mixture and cook 4-5 minutes until golden brown. For oven, spread on parchment-lined baking sheet and bake 10-12 minutes, flipping halfway.
Let cool slightly: Allow hash browns to cool for 1-2 minutes to firm up and become crispier.
Serve: Enjoy alone or use as bread replacement for breakfast sandwiches.