Preheat the Oven: Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper.
Prepare the Mixture: In a mixing bowl, whisk together the egg, olive oil (or melted butter), and Greek yogurt until well combined.
Add the Greens: Stir in the chopped spinach and dill until evenly distributed throughout the mixture.
Mix Dry Ingredients: In a separate bowl, whisk together the flour, baking powder, salt, black pepper, and garlic powder.
Combine Wet & Dry Ingredients: Gradually add the dry ingredients to the wet mixture, stirring until just combined. Be careful not to overmix!
Fold in the Feta: Gently fold in the crumbled feta cheese, ensuring it is evenly distributed without overmixing.
Shape the Cookies: Scoop out spoonfuls of the dough and place them onto the prepared baking sheet. Flatten them slightly with your hands to create a cookie shape.
Bake: Bake for 18-22 minutes, or until the cookies are golden brown on top and fragrant.
Cool & Serve: Let the cookies cool slightly before serving. Enjoy them warm or at room temperature!