Using half and half to thin down the yogurt adds 2.3g fat per serving (each recipe yields 4 servings), so keep that in mind as part of your 5g fat limit in an E or FP setting.
Need to be dairy-free? Try
Gwen's Coconut Yogurt recipe. (You probably won't need to add extra liquid to it.) If you need to be nut free, use the half and half option to thin down the yogurt, or try coconut milk instead. (Most people with nut allergies can have coconut products, but check with your doctor first to make sure.) Obviously the peanut butter option is off limits for nut allergies.