Preheat Oven and Grease:
Heat oven to 350°F (175°C) and grease a muffin tin.Prepare Vegetables and Feta:
Cut feta into cubes, dice bell pepper, grate and squeeze zucchini dry, slice scallions, and chop herbs.Whisk Dry Ingredients:
In a mixing bowl, combine all-purpose flour, whole wheat flour, baking powder, salt, pepper, paprika, and oregano with a whisk.Mix Wet Ingredients:
In a separate bowl, beat eggs, then whisk in milk, oil, and optional yogurt until smooth.Combine Wet and Dry:
Add the wet mixture to the dry ingredients and stir until just incorporated.Fold in Vegetables and Feta:
Gently fold in bell pepper, zucchini, scallions, herbs, and two-thirds of the feta cubes.Fill Muffin Cups and Top:
Spoon batter into muffin cups, then top with remaining feta and optional grated cheese.Bake Until Golden:
Bake for 20-25 minutes until the muffins are golden brown.Cool and Serve:
Allow to cool a few minutes; serve warm or at room temperature.