Layer 1/3 of the salsa on the bottom of the slow cooker
In a large bowl mix the red onion, black beans, corn, 1/3 of the cheese, & Southwest Fiesta blend
Divide the mixture equally between the tortillas and roll each tortilla up
Place a single layer of the stuffed tortillas lengthways on top of the salsa 5) top the layer of tortillas with 1/3 salsa, 1/3 of the cheese
Repeat with another layer of tortillas and top with the final layer of 1/3 salsa & 1/3 cheese
Cover and cook on HIGH for 2-3 hours or LOW for 6 hours
Remove the lid & broil for 3 minutes if you like color on top
Sprinkle with cilantro & optional toppings