Puerto Rico Nutrition Assistance Fairness Act This bill sets out a process to enable Puerto Rico to participate as a state in the Supplemental Nutrition Assistance Program (SNAP). Under current law, a state receives SNAP funding based on the number of participating households in the state whereas Puerto Rico receives a block grant to fund its nutrition assistance program. The bill requires Puerto Rico to submit to the Department of Agriculture (USDA) a plan of operation to transition away from the consolidated block grant program to SNAP. USDA must provide appropriate training and technical assistance to enable Puerto Rico to formulate such plan.