PREHEAT oven to 400°F.
SPRAY both sides of tortilla with cooking spray and sprinkle with 1/4 tsp. kosher salt. Bake 4 min. on each side.
SAUTÉ diced sausage and onion over medium heat 7 to 8 min. or until sausage browns and onions are tender.
MIX cream cheese with lemon juice, maple syrup and 1/2 tsp. salt.
SPREAD cream cheese mixture on crispy tortilla shell, then sprinkle sausage mixture, diced peaches and blue cheese on top.
PLACE assembled pizza back in oven for about 5 min.