2 eggs
1 2/3 cups milk
1 (8 ounce) container plain yogurt
1/4 cup vegetable oil
2 1/2 cups all-purpose flour
1 teaspoon baking powder
1/2 teaspoon baking soda
1/4 teaspoon salt
1 1/2 teaspoons ground cinnamon
1 apple - peeled, cored and diced