Preheat oven to 350°F/ 180°C. Line a muffin tin with 9 paper cases.
In a large mixing bowl beat eggs until foamy.
Add oil and sour cream and beat again until absorbed. Add cheese, poppy seeds, olives and oregano and mix gently with a rubber spatula until combined.
Mix the baking powder with the flour in a bowl and then gradually fold them into the batter.
Spoon the batter into the cups, filling them ¾ of the way full.
Bake for 20 minutes or until golden brown. Test with a toothpick, inserted in the center of a central muffin: it has to come out clean.
Let the muffins cool in the tins for 2-3 minutes and then transfer to a rack to cool completely.
Notes
Instead of feta you can use Bulgarian white cheese which is similar. Cottage cheese and ricotta are also very good options.
You can make mini muffins instead of large ones. One batch will make about 24.
For keto version of these muffins you need to substitute the wheat flour with almond flour (same quantity) or coconut flour (¼ cup only). If you use coconut flour, you may increase the quantity of the cheese. Another option would be to use 1 cup almond flour + ¼ cup coconut flour.
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