Place garlic unpeeled in a dish with olive oil, microwave on high for 1 to 1-1/2 minutes until very soft.

Squeeze garlic from skin into a bowl; mash with a fork until smooth.

Add Greek yogurt, mayonnaise, Dijon mustard, lemon juice, salt and pepper.

Stir well until fully incorporated.
Can be made ahead and refrigerated for up to three days.