Cut onions and separate each onion slice's inner circles; place in a microwave-safe container.
Generously salt and toss with your hands.
Cook in the microwave for 5 minutes, covered with a paper towel to prevent splatter.
Rinse onions in water several times, and drain well.
Place on paper towels and pat dry; leave on the paper towels.
Take out two separate deep bowls and place them on a flat surface.
Combine almond milk, nutritional yeast, and flour using a single-cup blender. Blend until smooth. It will resemble pancake batter.
Then, using a second bowl, combine bread crumbs, cornmeal, garlic salt, and cayenne (if you like it spicy). Mix the contents of this bowl with a fork.
Begin dipping onions, first in the almond milk batter, then in the bread crumb mixture, ensuring the bread crumbs adhere to the onions.
Place on a silicone-lined or parchment paper-lined cookie sheet.
Preheat oven to 425 degrees.
Place onions on the cookie sheet, making sure not to put them on top of each other for even cooking.
Cook for 30 minutes or until brown.
I served the baked onion rings with organic ketchup, but you may dip it in any dip.