Heat oven to 400 degrees . Grease bottoms only of 12 medium muffin cups or line with paper baking cups. Beat egg in large bowl with fork. Stir in milk and butter. Stir in remaining ingredients, except berries and streusel topping, just until flour is moistened. Fold in berries. Divide batter evenly among muffin cups; sprinkle with streusel topping. Bake until golden brown 20 to 25 minutes. Let stand 5 minutes before removing from pan.