Set 8 slices of country white sandwich bread out at about 70°F for 5 minutes, then choose 4 top slices and cut two uneven triangle eyes plus one crooked mouth in each. Keep every opening at least 1/2 inch from the crust, and press the blade straight down instead of sawing so the bread doesn't tear. Small faces work best. For Halloween Party Food Sandwiches, the cutouts need enough open space for the orange cheddar to show without weakening the whole slice. You'll see clean openings with soft crumbs at the edges, and the slices should still lie flat without splitting. Cut too close to the crust and the top can break when you flip it. Clean cuts keep the sandwich sturdy during toasting.

Keep the smoked deli ham and sharp orange cheddar at 40°F or colder until you start, then finish assembly within 10 minutes so the filling stays firm while you work. Stir the mayonnaise and Dijon mustard together for 20 seconds, spread 1 tablespoon across each of the 4 bottom slices and leave a 1/4-inch border. Keep it thin. Fold 2 ham slices loosely onto each base, add 1 cheddar slice and close with a face-cut top. Then mix the softened unsalted butter with garlic powder and coat every outside surface lightly. The sandwiches should look slightly uneven, with soft ham folds at a few edges and orange cheddar clearly visible through every face opening. Overfill them and the cheese can slide out before the bread sets. Thin layers help the bread crisp before the filling escapes.

Warm a 12-inch skillet over medium-low heat until the surface reaches about 325°F, then add all 4 sandwiches with the face sides down and leave small gaps between them. Press each sandwich gently for 5 seconds, then cook for 3 to 4 minutes without sliding them around. Don't rush it. Rotate the skillet once at minute 2 if your burner heats unevenly. (My first batch went in hotter, and the cut edges darkened before the cheese softened.) Halloween Party Food Sandwiches need moderate heat so the bread colors before the filling overheats. Listen for a soft steady sizzle and look for deep golden patches around the eye and mouth cutouts. If butter smells nutty too soon or the sizzle turns sharp, the pan is too hot. Moderate heat browns the bread while the cheddar starts to soften.

Flip all 4 sandwiches once and shift each one to a new spot in the skillet, then keep the heat near 325°F for another 2 to 3 minutes. Press lightly for 3 seconds after the flip and leave them alone while the second side browns. One flip is enough. Check one sandwich at minute 2, and continue only until the cheddar is glossy and soft enough to bulge slightly through the face openings. Go much longer and the buttered bread can scorch before the cheese settles into the ham. You'll see amber patches on the second side and orange cheese bubbles at cut edges. The bread should sound crisp when tapped, but the center should still flex. Halloween Party Food Sandwiches stay crisp when the second side gets enough heat without drying out.

Transfer the 4 sandwiches to a large white serving plate and let them rest for exactly 2 minutes before serving. Don't stack them. Keep the faces in a loose cluster because trapped steam can soften crisp bread in under 3 minutes. Meanwhile, the cheese settles from fluid to softly stretchy and the centers stay near 140°F. Halloween Party Food Sandwiches look better when the four faces sit at slightly different angles and keep their homemade shapes. The bread should show non-uniform golden and amber patches, with glossy orange cheddar visible through each crooked face and crisp crumbs at the edges. Stack them too soon and the bottom slices turn damp. A short rest lets steam escape before the first bite.