3 T. Greek yogurt, 1 t. spicy brown mustard, pinch Truvia, pinch salt, makes a pretty fair substitute for mayo for salads, veggie dip, etc.  I added more mustard and more Truvia and ended up with a not-bad substitute for honey mustard dip!  Add spices, minced onions, chili powder ~ use your imagination.

that’s sounds really good i have to try that

I Mixed my tuna with greek yogurt, mustard and spices taste just like I used mayo

I taste too much mustard in this- even by adding more greek yogurt- I didn’t think it was that great.