Good-Cooking - Rhubarb Coffeecake

Ingredients

• 3/4 cup granulated sugar
• 3 tablespoons flour
• 1/4 teaspoon ground nutmeg
• 1 teaspoon salt
• 1/2 teaspoon vanilla extract
• 1/4 cup (1/2 stick) cold butter, cut up
• 2 cups all-purpose flour
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1/2 teaspoon nutmeg
• 1/2 teaspoon salt
• 1/2 cup (1 stick) butter, at room temperature
• 1/2 cup granulated sugar
• 2 eggs
• 1 teaspoon vanilla extract
• 1 cup sour cream
• 2 cups diced rhubarb