let it crumble crumb coffee cake | table&spoon

Ingredients

• 1/3 cup unsalted butter at room temperature
• 1/2 cup sugar
• 1 egg
• 1/4 cup crème fraiche or sour cream
• 2/3 cup milk
• 1 tablespoon vanilla extract
• 2 cups all-purpose flour
• 1 tablespoon baking powder
• pinch of salt
• 1 3/4 cup flour
• 1 cup brown sugar
• 3/4 cup unsalted butter, melted
• 1 tablespoon ground cinnamon