Preheat oven to 400 degrees F. Coat a 12-cup muffin tin with cooking spray.
In a large bowl, whisk together the 1 cup cornmeal, whole wheat flour, sugar, orange zest, baking powder, baking soda and salt.
In a medium bowl, whisk together the eggs, buttermilk, yogurt and oil.
Stir the buttermilk mixture into the cornmeal mixture just until combined.
In a small bowl, toss the berries with 1 tablespoon cornmeal. Stir the cranberries into the muffin batter.
Using a ¼ cup measure, divide the batter evenly between the muffin tins.
Bake until a toothpick inserted in the middle of a muffin comes out clean, about 12 minutes.
Cool the muffins in the tin for 10 minutes, then remove from the tin and cool completely on a wire rack. Serve or store in an airtight container.
Notes
Please note that I am not a medical or nutritional professional. I provide nutritional information for my recipes as a courtesy to my readers. It is calculated using the built-in recipe card calculator. While I attempt to provide information that is as accurate as possible, you should calculate the nutritional information independently before relying on it.