01 - Adjust oven rack to center and preheat oven to 375°F (190°C).
02 - In a large mixing bowl, combine all-purpose flour, baking powder, and salt. Whisk thoroughly to distribute rising agent.
03 - In a separate bowl, whisk eggs until blended, then add milk and olive oil. Whisk until smooth.
04 - Pour the wet mixture into the dry ingredients. Add cooked spinach, crumbled feta, and chopped dill. Gently fold until just combined. Do not overmix.
05 - Evenly divide batter among 12 standard muffin tin cups lined with paper liners or greased. Bake for 20 to 25 minutes, or until tops are golden and a toothpick inserted in the center comes out clean.
06 - Remove muffins from oven and let cool in tin for 5 minutes. Transfer to wire rack to finish cooling.