Greek Style Turkey Burgers with Pepperoncini Sauce

 1 1/2 tablespoon olive oil, divided

1/2 cup finely chopped onion

5 ounces baby spinach

salt and pepper`

1/4 cup nonfat plain Greek yogurt

1/4 cup light mayonnaise

2 tablespoons minced seeded pepperoncini

1 tablespoon liquid from the pepperoncini jar

1 - 2 teaspoons lemon juice

1 teaspoon minced garlic

3 ounces crumbled feta cheese

2 tablespoons fresh chopped oregano

1 pound ground turkey

Heat grill to medium.

In a large skillet over medium-high heat, heat 1 tablespoon olive oil.  Add onion, cook stirring occasionally, until golden brown, about 5 minutes.  Add remaining 1/2 tablespoon of olive oil and the spinach and cook, stirring until the spinach is wilted. Season with salt and pepper, then transfer mixture to a bowl. Chill in refrigerator until cooled to room temperature.

Meanwhile, in a small bowl combine the yogurt, mayonnaise, pepperoncini, pepperoncini liquid, lemon juice, garlic and salt and pepper to taste. Set aside.

Once the spinach has cooled, remove it from the refrigerator and add the feta, oregano, ground turkey, 1/4 teaspoon salt and pepper. Mix well, then shape into 4 patties, each about 1/2-inch thick. Spray the burgers with nonstick cooking spray, then grill over medium heat until just cooked through, about 6 minutes per side. Serve with the yogurt sauce. Serves 4.