Preheat oven to 425 degrees F and line baking sheets with aluminum foil.
In small bowl, mix together salt, pepper, onion powder, coriander, ancho chile pepper, and cayenne pepper until combined; set aside.
Thinly slice potatoes (about 1/8" thick or thinner) using a sharp knife, mandolin, or food processor. Place potato slices in icy cold water for about 10 minutes. Remove from water and pat dry with paper towels. Toss potato slices in large bowl with olive oil, add seasoning mix, and toss to coat.
Place potato slices on prepared baking sheets and bake at 425 degrees F for about 10-20 minutes per side or until crispy; rotate pans halfway through. (Baking time may vary depending on thickness of potatoes.)
Move potatoes close to each other on pans and sprinkle cheese and Canadian bacon on top. Place back in oven for 3-5 minutes or until cheese has melted. Remove from oven and top with green onion and additional toppings as desired.
SNAPPY TIPS: The thinner you cut the potatoes the quicker they will cook and the crispier they will be.SNAPPY SUBSTITUTIONS: Instead of the homemade seasoning mix, you can substitute your favorite taco seasoning mix.
Keywords: Irish nachos, St. Patrick's Day potatoes