Best Cranberry Muffins

• 375 oven until golden brown
• 1 egg
• 1 cranberries (fresh)
• 1/2 full
• 2,700 gr muffin (pan)
• 190 gr unsifted flour
• 120 ml milk
• 100 gr sugar
• 100 gr cinnamon-sugar over batter in bake in a preheated
• 55 gr butter