Pre-heat your oven to 350 degrees and spray a 12 cup standard muffin tin with non-stick spray.
Cook your bacon slices in a large skillet until browned and crispy. Drain on paper towels when done.
After letting the grease drain off the bacon, slice the bacon into 1/2 inch slices and set aside.
In a large bowl, add your eggs, milk, salt, and pepper and whisk together until the eggs are completely broken up.
Add 1/4 cup of egg mixture to each of the sprayed muffin cups.
Add 1 tablespoon of cheese into each muffin cup.
Add about a tablespoon of bacon to each muffin cup. It's a little hard to measure chunks of bacon like this so just add in each muffin cup until you have about the same amount in each. (You can never have too much!)
Sprinkle each muffin cup with the chives and bake for 40 minutes or until the eggs are slightly browned and cooked through.
You can eat these immediately or let them cool then place them in a zip-top bag for a breakfast on the go. Just microwave each for about 30 seconds and enjoy!