Baked Monte Cristo Party Sliders

Name: Baked Monte Cristo Party Sliders
Prep time: 10 min
Cook time: 35 min
Total time: 45 min
Cuisine: American
Ingredients: 12 savory or sweet rolls ((see note)); 12 slices deli ham; 12 slices deli turkey; 12 slices swiss cheese; ½ cup butter ((8 tablespoons), melted); 1 egg; 2 tablespoons dijon mustard; 1-2 tablespoons tablespoons powdered sugar; raspberry preserves