Preheat oven to 400F. Spray a 9x13 baking dish with cooking spray.
Heat bacon in a skillet over medium heat. Cook until crisp, about 2-3 minutes per side. Transfer out of pan, reserving 1 tbsp fat in pan. Drain, chop, and place in a bowl.
Add spinach to the same pan and cook for one minute. Transfer out of pan and place in bowl.
Add eggs, salt and pepper to bowl and stir to combine.
Add to baking dish and bake until top is golden brown and center is set, about 10-15 minutes.
