Rhubarb-Lemon Muffins with Streusel Topping Recipe

Ingredients

• ½ cup packed brown sugar
• ⅓ cup each all-purpose flour
• and old-fashioned rolled oats
• 4 Tbsp. unsalted butter, melted
• 2 cups all-purpose flour
• 1 Tbsp. baking powder
• ½ tsp. each table salt and
• ground ginger
• 1 cup granulated sugar
• ½ cup buttermilk
• ¼ cup vegetable oil
• 2 eggs, room temperature
• 1 Tbsp. minced lemon zest
• 2 Tbsp. all-purpose flour
• 2 Tbsp. granulated sugar
• 1 ¾ cups diced fresh rhubarb