Arrange the whole baby bell peppers in a single layer on an air fryer rack. Air fry at 370 degrees for 7 - 9 minutes or bake at 400 for 12 - 15 minutes, until lightly blistered. Let stand until cool enough to handle.
Meanwhile, prepare the tabbouleh. Place the bulgur in a small dish and add the hot water. Cover and let stand for 10 minutes, until the water has fully absorbed. Fluff the bulgur with a fork and transfer to a large mixing bowl.
Add lemon juice, garlic powder, coriander, black pepper, parsley, chives, mint, and tomatoes. Mix well to combine. Season with salt to taste and aside.
Cut a small slit along the sides of the roasted baby bell peppers. Remove the seeds if prominent; you may not need to. Gently hold the little peppers open and stuff with the tabbouleh, heaping it generously on top.
Serve warm or at room temperature.