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Preheat Oven: Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
Assemble Croissants: Spread a thin layer of Dijon mustard on the bottom half of each croissant. Layer 2 slices of ham and 1 slice of cheese on top, then place the other half of the croissant on top.
Prepare Butter Topping: In a small bowl, mix melted butter, garlic powder, and poppy seeds (if using). Brush the butter mixture over the tops of the croissants.
Bake: Place the croissants on the prepared baking sheet. Bake for 12-15 minutes, or until the cheese is melted and the croissants are golden brown.
Prep Time: 5 minutes | Bake Time: 15 minutes | Total Time: 20 minutes | Servings: 6 croissants.
Enjoy your Baked Ham and Cheese Croissants!