1. Line a microwave-safe plate with 3 layers of paper towels. Place bacon on top, without overlapping. Cover with another 2 layers of paper towels. Microwave on high 4–5 min.
2. Meanwhile, in a large bowl, whisk mix with egg, milk, and oil. Let batter rest 5 min; it will continue to thicken.
3. Finely chop bacon and green onion. Fold chopped bacon, green onion, and cheese into batter.
4. Cook waffles according to waffle maker instructions.