Follow these simple steps to create your Smashed Croissant Sandwiches:

1. Prepare the Filling: In a bowl, mix the shredded chicken, mayonnaise, Dijon mustard, garlic powder, salt, and pepper until well combined.
2. Preheat the Pan: Heat a large skillet over medium heat and add a little butter to coat the bottom.
3. Slice the Croissants: Carefully cut each croissant in half horizontally, creating a top and bottom.
4. Assemble the Sandwiches: Spread a generous amount of the chicken mixture on the bottom half of each croissant. Top with cheese and a handful of spinach or arugula.
5. Close the Sandwiches: Place the top half of the croissant back on.
6. Smashed Cooking: Place the sandwiches in the hot skillet. Use a spatula to gently press down on each sandwich to flatten them slightly.
7. Cook Until Golden: Cook for 3-4 minutes, or until the bottom is golden brown. Flip the sandwiches and add more butter to the pan if needed. Cook the other side for another 3-4 minutes.
8. Melt the Cheese: If the cheese isn’t fully melted after flipping, cover the skillet with a lid for a minute to help it along.
9. Remove and Cool: Once both sides are golden and the cheese has melted, remove the sandwiches from the skillet and let them cool for a minute before serving.
10. Slice and Serve: Cut the sandwiches in half for easier handling, and enjoy them warm.