A blush of summer -blueberry chocolate chip muffins

Ingredients

• 1 cup of yogurt
• 3/4 cup sugar
• 1/2 teaspoon baking soda
• 11/4 teaspoon baking powder
• 1/2 cup melted salted butter
• 11/2 cups whole wheat pastry flour
• 1/3 cup semi-sweet chocolate chips
• 1/3 cup blueberries
• Ground nutmeg
• Cooking spray for greasing the muffin pan