Creating Spinach Feta Muffins is simple if you follow these steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C) and line a muffin tin with paper liners or grease it with cooking spray.
2. Prepare Dry Ingredients: In a large bowl, whisk together the flour, baking powder, baking soda, salt, black pepper, garlic powder, and oregano (if using).
3. Combine Wet Ingredients: In another bowl, beat the eggs, then add the milk and olive oil. Mix well.
4. Add Spinach and Feta: Fold the chopped spinach and crumbled feta cheese into the wet mixture until evenly distributed.
5. Mix All Together: Pour the wet ingredients into the dry ingredients. Stir gently until just combined; be careful not to overmix.
6. Fill Muffin Tin: Spoon the batter into the prepared muffin tin, filling each cup about two-thirds full.
7. Bake: Place in the preheated oven and bake for about 20-25 minutes, or until a toothpick entered into the center comes out clean.
8. Cool: Once baked, allow the muffins to cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.

With these clear instructions, you’re well on your way to making delicious muffins!