Rhubarb Muffins

Bahan-bahan (12 porsi)

• 2 cups rhubarb (chopped)
• 1 ¾ cups all-purpose flour
• ⅔ cup granulated sugar
• 2 teaspoons baking powder
• ¼ teaspoon salt
• 1 egg (beaten)
• ½ cup milk
• ½ cup vanilla Greek yogurt
• ¼ cup butter (melted, or vegetable oil)
• 2 teaspoons vanilla extract
• streusel topping (recipe in notes)