Preheat the oven to 400°F (200°C). Generously grease a 12-cup muffin pan with nonstick cooking spray.
Pat the thawed hash browns dry with paper towels to remove excess moisture.
Divide the hash browns evenly among the muffin cups, filling each about two-thirds full.
Press the potatoes firmly into the bottom and up the sides of each cup to create a nest.
Bake for 20 minutes, or until the edges are crisp and golden brown.
Meanwhile, whisk together the eggs, salt, and black pepper in a large bowl. Stir in the shredded cheddar cheese.
Reduce the oven temperature to 350°F (175°C).
Carefully pour the egg mixture into each crispy potato cup.
Sprinkle the crumbled turkey bacon evenly over the tops. Add extra cheese if desired.
Bake the Hash Brown Egg Cups for 12–15 minutes, or until the eggs are fully set.
Allow the cups to cool for 2–3 minutes before running a knife around the edges and gently removing them from the pan.
Garnish with fresh chives or parsley and serve with hot sauce if desired.