Spinach & Herb Turkey Burgers with Portobello "Buns"


This low-carb burger replaces the typical bun with roasted portobello mushroom caps. Creamy tzatziki and crisp sliced red onion add texture and flavor to this easy Greek-inspired burger recipe.

Prep Time:
20 mins
Additional Time:
15 mins
Total Time:
35 mins
4 burgers


  • 1 pound lean ground turkey

  • 1 cup frozen chopped spinach, thawed and squeezed dry

  • cup Kalamata olives, chopped

  • 1 ½ teaspoons lemon zest

  • 1 teaspoon garlic powder

  • ½ teaspoon dried oregano

  • ¾ teaspoon salt, divided

  • ½ teaspoon ground pepper, divided

  • 2 tablespoons extra-virgin olive oil

  • 8 large portobello mushrooms, stems removed (see Tip)

  • 4 tablespoons tzatziki

  • 1 cup arugula

  • 8 (1/4 inch thick) rings red onion


  1. Position racks in upper and lower thirds of the oven; preheat to 425 degrees F. Coat a baking sheet with cooking spray.

  2. Combine turkey, spinach, olives, lemon zest, garlic powder, oregano, 1/2 teaspoon salt and 1/4 teaspoon pepper in a medium bowl; mix well. Form into four 4-inch patties. Place on the prepared baking sheet.

  3. Brush oil all over the portobellos, then sprinkle with the remaining 1/4 teaspoon each salt and pepper. Place the mushrooms on a wire rack placed over another large rimmed baking sheet. Place both baking sheets in the oven and bake, switching positions halfway through, until the mushrooms are soft and the burgers are cooked through, 14 to 16 minutes.

  4. Place each turkey patty on a mushroom cap. Top each with 1 tablespoon tzatziki, 1/4 cup arugula and 2 onion rings. Top with the remaining mushrooms.


Tip: To prepare portobello mushroom caps, gently twist off the stems of whole portobellos. Using a spoon, scrape off the brown gills from the underside of the mushroom caps. If you prefer, purchase portobello mushroom caps, rather than whole mushrooms.

Nutrition Facts (per serving)

340 Calories
25g Fat
14g Carbs
28g Protein
Nutrition Facts
Servings Per Recipe 4
Serving Size 1 burger
Calories 340
% Daily Value *
Total Carbohydrate 14g 5%
Dietary Fiber 4g 16%
Total Sugars 7g
Protein 28g 56%
Total Fat 25g 32%
Saturated Fat 4g 21%
Cholesterol 86mg 29%
Vitamin A 4779IU 96%
Vitamin C 5mg 6%
Folate 129mcg 32%
Sodium 743mg 32%
Calcium 107mg 8%
Iron 3mg 17%
Magnesium 81mg 19%
Potassium 1160mg 25%

Nutrition information is calculated by a registered dietitian using an ingredient database but should be considered an estimate.

* Daily Values (DVs) are the recommended amounts of nutrients to consume each day. Percent Daily Value (%DV) found on nutrition labels tells you how much a serving of a particular food or recipe contributes to each of those total recommended amounts. Per the Food and Drug Administration (FDA), the daily value is based on a standard 2,000 calorie diet. Depending on your calorie needs or if you have a health condition, you may need more or less of particular nutrients. (For example, it’s recommended that people following a heart-healthy diet eat less sodium on a daily basis compared to those following a standard diet.)

(-) Information is not currently available for this nutrient. If you are following a special diet for medical reasons, be sure to consult with your primary care provider or a registered dietitian to better understand your personal nutrition needs.

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