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