In a medium bowl, stir together the salsa, cream of mushroom soup and cream of chicken soup
Mix in most of the cheese, reserving 3/4 cup for later
Place a layer of tortillas covering the bottom of a slow cooker
Scoop a layer of the ground beef over that, and then spoon a layer of the cheese mixture
Repeat the layers until you run out of stuff, ending with a layer of tortillas on the top
Top with remaining cheese
Cover and & bake 350 oven for 45 minutes to 1 hour