In the slow cooker, combine:
1-2 chopped bell peppers
1-2 chopped onions
1 chopped yellow squash (I promise you won't taste it in the end - I got one free from a coworker)
1 can Ro-tel (or similar) diced tomatoes w/ green chiles
1 can drained diced tomatoes or some diced fresh ones
Some combo of fajita seasoning, Tabasco chipotle hot sauce (DE-licious), taco seasoning, etc.
Some kind of cubed boneless skinless meat (beef, pork, chicken, whatever)
Cook everything on high for 3-4 hours or low for 6-8 hours
Before serving, add 1/2 block of cream cheese (low fat is good but don't use nonfat) and stir to melt. Serve on tortillas. YUMMY!