Preheat oven to 375 degrees F. Grease muffin tins or line with paper cups.
In a large miing bowl, whisk together eggs and sugar until light. Add milk, yogurt, vanilla, and melted butter. Gently whisk.
In another bowl, combine flour, baking powder, salt, and cinnamon. Add to milk mixture and stir just until flour disappears. Gently stir in berries.
Spoon thick batter into muffin cups to the top. Bake about 25 minutes, until tster comes out clean. Invert and cool on rack.