Preheat the oven to 350°F and lightly grease a baking dish with nonstick spray.
In a medium mixing bowl, whisk together the eggs, milk, salt, and pepper until fully combined.
Heat 1 tablespoon of butter in a skillet over medium-high heat. Once the butter is hot, add the eggs and cook, stirring occasionally, until fully scrambled and cooked through.
Slice the croissants in half and arrange the bottom halves in the prepared baking dish.
Layer a handful of spinach on each croissant bottom, then spoon on the scrambled eggs. Top each with a slice of sausage and a slice of Colby Jack cheese.
Place the top halves of the croissants over the assembled layers.
Microwave the remaining 1 tablespoon of butter until melted. Brush the melted butter over the top of each croissant, then sprinkle with Everything Bagel Seasoning.
Bake in the preheated oven for 10 minutes, or until the croissants are golden brown and the cheese is melted.
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Notes
These sandwiches can be prepared ahead of time and stored in the fridge for an easy grab-and-go breakfast option.
Wrap each sandwich individually in foil or plastic wrap to keep them fresh and easy to reheat.
For freezer meal prep, assemble, wrap, and freeze; reheat in the oven or microwave when ready to eat.
Don’t overfill the croissants to help keep them from falling apart while eating.
Swap out the protein, cheese, or veggies to customize each sandwich to your taste.