Preheat the oven to 375ºF/190ºC. Line a sheet pan with parchment paper and set it aside.
In the bowl of a food processor, add the plantain chips and pulse until they resemble breadcrumbs.
Add the crushed plantain chips to a large shallow bowl along with the nutritional yeast, Italian seasoning, garlic powder, onion powder, and salt. Mix together and set aside.
Use a sharp knife to cut the chicken breasts in half length-wise. Beat the egg in a separate shallow bowl.
Dredge each piece first in the egg and then in the seasoned breadcrumb mixture. Repeat until you've used up all the chicken.
Transfer the breaded pieces of chicken onto the sheet pan lined with parchment paper, leaving space in between each piece.
Bake for 15 minutes, flip the chicken breasts over, and bake for another 15 minutes. Remove from the heat, and top each piece with marinara sauce and slices of mozzarella cheese. Broil on high for 2 minutes until the cheese is melted (or soft) and the edges are golden brown. The chicken is done when the internal temperature of the chicken reads 165ºF on a meat thermometer.