Preheat your oven to 350°F (175°C)and line a muffin tin with paper liners.
In a large mixing bowl, whisk together the all-purpose flour, whole wheat flour, baking powder, baking soda, salt, and black pepper.
In a separate bowl, whisk together the hempseed oil, Greek yogurt, milk, and eggs until well combined.
Add the wet ingredients to the dry ingredients and stir until just combined. Do not overmix.
Fold in the crumbled feta cheese, chopped spinach, sun-dried tomatoes, and fresh basil.
Spoon the batter into the prepared muffin tin, filling each cup about 2/3 full.
Bake for 18-20 minutes or until a toothpick inserted into the center of a muffin comes out clean.
Remove the muffins from the oven and let them cool in the tin for 5 minutes, then transfer them to a wire rack to cool completely.