Cook the bacon in a large skillet over medium heat until crisp. Remove the bacon from the skillet, drain on paper towels, and chop into bits.
Heat the oven to 375 degrees. Coat a muffin tin with cooking spray.
Remove one pie crust from the pouch. Place it on a flat surface.
With a 3-inch round cutter, cut 12 rounds from each crust (you will have to re-roll the scraps).
Press 1 pie crust round into the bottom and up sides of each muffin cup.
Sprinkle bacon bits into each cup, then add a touch of shredded Gruyere cheese.
Whisk the eggs and milk until very well combined, about 2 minutes. Season with a bit of sea salt and freshly cracked pepper to taste; whisk to combine.
Carefully pour some of the egg mixture into each cup, without going above the crust.
Place in the oven and bake until the egg is fluffy and cooked through and the crust is golden, about 15 minutes.
Remove from the oven and cool for a few minutes before placing them on a serving plate.
Serve with your favorite hot sauce, if desired. Enjoy.