Preheat Oven: Set oven to 350°F (175°C) to ensure even baking.
Slice Croissants: Cut each croissant in half lengthwise; toast lightly if desired.
Spread Dijon Mustard: Apply a thin layer of mustard on the inside of each croissant half.
Layer Ingredients: Place one slice of ham and one slice of cheese (or two for extra melty goodness) on the bottom half of each croissant.
Assemble & Brush: Close the croissants and place them on a parchment-lined baking sheet. Brush the tops with melted butter.
Season (Optional): Sprinkle with dried thyme and garlic powder for added flavor.
Bake: Bake for 10-12 minutes, until the croissants are golden and the cheese is melted.
Serve & Enjoy: Let them cool slightly and enjoy with a fresh salad or warm soup.