Combine ingredients for burgers in bowl, mixing gently. The mixture is pretty wet. You can omit the egg or squeeze some of the liquid out of the zucchini to make forming patties a little easier.
Form patties in desired size. I used a 1/4 cup ice cream scoop which made smaller sized patties roughly 1.5 ounces in weight. This made about 15 appetizer sized patties.
Sear over medium high heat and place on parchment or silpat lined baking sheet.
Bake in oven for 6-8 minutes.
Serve with yogurt sauce.