1- In a skillet over medium high heat, cook ground beef and onion until browned, then drain excess grease
2- Add garlic and taco seasoning, then cook briefly until fragrant
3- Transfer mixture to a slow cooker and add diced tomatoes, black beans, corn, salsa, cheddar cheese soup, and cream cheese, then stir to combine
4- Cover and cook on low for 3 to 4 hours or high for 2 hours, stirring occasionally if possible
5- During the last 20 minutes, stir in 1 cup shredded cheese and half of the crushed tortilla chips
6- Sprinkle remaining cheese on top, cover, and cook until melted