Preheat the oven to 350F (180C). With an electric mixer, mix the eggs, vinegar, yeast, baking powder, salt, baking soda, sugar, olive oil and yogurt. Mix until just combined.
Add the flour and fold with a spatula. Add the feta cheese, olives and zaatar, and fold until just combined.
Spray 12 muffin pan cavities with non stick spray, or lightly oil and dust with flour. Divide the batter evenly among the compartments.
Bake for 20-23 minutes or until golden brown and toothpick inserted comes out clean. I baked on the middle rack for 15 min, then on the top rack for the last 5 min to get that golden color.
Video
Notes
You can use all black olives or all green olives, just get the ready sliced and pitted onces for convenience.Storing Leftovers: Leftover muffins can be stored in an airtight container in the fridge for 2-3 days. You can warm them briefly in the microwave if you like.Freezing muffins: Muffins can be frozen in an airtight container for 2-3 months.