In a small bowl combine Greek yogurt, mayonnaise, Dijon mustard, and garlic. Set aside.
Cut the rotisserie chicken into small cubes. Try using as much of the breast before cutting into the dark meat.
Roughly chop the toasted almonds, red onion, celery, and slice the grapes in half.
Place all the chopped ingredients in a bowl and toss to combine.
Add the dressing and mix it into the salad. Season with salt and pepper according to your liking. Serve chilled on its own or sandwiched between toasted croissants or even as a lettuce wrap.
Notes
Make sure the chicken is cold- Chill the rotisserie chicken pieces a little before adding them to the salad. Hot chicken would melt the dressing and wilt the lettuce leaves.
Use Greek yogurt- This thicker yogurt variety will give your dressing a very creamy texture. Use plain rather than any flavor to get the best tangy taste.
Cut the vegetables small- Dice the celery, almonds, and onion smaller than the chunks of chicken. Also half the grapes so you don't get a mouthful of just one ingredient.
Only prepare what you plan to serve- Since the lettuce will wilt over time, only make as many lettuce wraps as you'll use in a day. Assembly is nice and quick anyway.