Heat oven to 400°F. Cover a baking sheet with foil and spray with cooking spray.
Cut each jalapeno in half lengthwise. Scoop out seeds and white ribs with a spoon. Remove all ribs for mild poppers, leave some for spicier ones.
Mix cream cheese, shredded cheese, garlic powder, onion powder, salt, and pepper in a bowl until well combined.
Fill each jalapeno half with the cheese mixture, packing it in firmly.
Open crescent roll tube. Press two triangles together to form a rectangle. Repeat with remaining triangles to make 4 rectangles total. Cut each rectangle lengthwise into 10 thin strips.
Take 2 dough strips and wrap them around each stuffed pepper, crisscrossing to create a mummy appearance. Leave space for eyes.
Place all wrapped peppers on the baking sheet. Brush dough with egg wash.
Bake 12 minutes until golden brown.
Immediately press 2 candy eyes or olive slices into each mummy while dough is warm.
Let cool 5 minutes before serving.
