Step 1

For the sauce, mix all ingredients in a medium bowl and chill until serving.

Step 2

For the meatloaf, line a rimmed baking sheet with parchment paper and preheat the oven to 325F.

Step 3

In a large mixing bowl, combine the turkey, spinach, almond flour, eggs, onion, salt, marjoram, and pepper. Mix with your hands until very well combined.

Step 4

Place half of the turkey mixture on the prepared baking sheet and shape into a flat rectangle, about 1 inch thick. Cover with 3/4 cup of the feta cheese. Place remaining turkey mixture overtop of feta and shape the whole thing into a rough loaf. Sprinkle with the remaining feta, pressing lightly to adhere.

Step 5

Bake for 1 to 1 1/4 hours, or until the internal temperature reaches 160F on an instant read thermometer.

Step 6

Cut into slices and drizzle with tzatziki sauce, passing remaining sauce at the table.