• Brown ground beef and onion together.  Drain.
• In a medium bowl, stir together the salsa 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,  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 cook on High for 45 minutes to 1 hour or on low for 2-3 hours.

Freezer to Slow Cooker Instructions

• If you'd like to do this one freezer to slow cooker, you will have to have 3 separate bags.  One would contain the ground beef and onion mix.  The next would contain the salsa, soup and cheese.  Lastly, the cheese for the top would be added in a different bag.  You would wait to assemble it the day of cooking.