01 - Preheat the air fryer to 350°F for 3 minutes to ensure proper cooking temperature.
02 - Unroll the croissant dough and separate into 4 individual triangles on a clean surface.
03 - Spread a thin layer of Dijon mustard onto each triangle if desired for added flavor.
04 - Place 1 slice of roast beef, 1 slice of ham, and 1 slice of cheese on the wide end of each triangle.
05 - Roll each croissant starting from the wide end, tucking in the sides to secure the filling inside.
06 - Position croissants seam-side down in the air fryer basket, leaving space between each one.
07 - Brush the tops lightly with softened butter for enhanced browning and crispiness.
08 - Cook for 7 to 8 minutes until golden brown and crispy. Allow to cool for 2 to 3 minutes before serving.