Step 1

Place butter and onions in a pot. Let onions caramelize, covered, for about 15 minutes over medium-high heat, turning often. When onions turn golden, add balsamic and stir. Let caramelize for an additional 2 minutes. Use a slotted spoon to remove onions from pot and let cool.

Step 2

Grease a 9×13" baking pan. Spread out torn croissants in pan, and bake for 10-15 minutes until croissants are nicely toasted and crispy.

Step 3

While croissants are toasting, cook bacon in a pot over medium-high heat until crispy, about 10-15 minutes. Remove bacon from pot with a slotted spoon and let cool in a separate bowl.

Step 4

Whisk together eggs, milk, salt and pepper. Add half of the cheese. Stir. Pour mixture evenly over croissants.

Step 5

Add bacon and caramelized onions evenly throughout pan. Evenly sprinkle the remaining cheese on top of the strata.

Step 6

Refrigerate strata for at least 30 minutes, or even overnight. Preheat oven to 350℉.

Step 7

Snip chives over the top of the strata before baking for 50-55 minutes, until egg mixture is set in the middle and the top is deep golden brown.

Step 8

Wait 10-15 minutes before slicing. Delicious served warm or room temp!