Preheat oven to 375 degrees and spray a regular-sized 12 cup muffin tin with olive oil cooking spray (wipe the excess spray off).

Add hash browns to each muffin cup, only to about a little less than half the height of the cup. Bake for about 20-23 minutes, until some of the hash browns have browned.

Beat eggs with heavy cream and add salt and pepper. Layer a little bunches of spinach and cheese into each cup. Add egg-cream mixture to each muffin cup filling to about 2/3 of the height of each cup (I used a measuring cup with spout for easy pouring). Top with a pinch of spinach and another pinch or two of Dubliner cheese.

Bake for 12-15 minutes until eggs are firm. Allow egg cups to sit in the tin for a few minutes before running a butter knife around the sides to loosen. Serve with Dubliner cheese sprinkled on top.