1. Place a tortilla on a microwave-safe plate and cover evenly with 1/3 cup shredded cheddar cheese, Out of a second tortilla, cut eyes, a nose, and a jagged mouth.
2. Place cut-out tortilla on top of cheese-covered tortilla and microwave for about 45 seconds, or until cheese is melted.
3. Create a stem with a celery piece. Repeat with remaining tortillas and cheese.