Coffee Cake in a Soft

My deliriously soft coffee cake has a surprise ripple of cinnamon in the middle and a super simple streusel topping. This recipe takes just 30 minutes to prep and makes enough to feed a crowd (if you're willing to share!).

Ingredients

• ½ cup unsalted butter, softened (113g)
• ½ cup light brown sugar, firmly packed (100g)
• ¼ cup granulated sugar (50g)
• 1 large egg
• ¼ teaspoon vanilla extract
• 2 cups cake flour (225g)
• 1 Tablespoon cornstarch
• 1 teaspoons baking powder
• ¼ teaspoon baking soda
• ½ teaspoon salt
• Streusel
• 6 Tablespoons unsalted butter (85g)
• 1 ¼ cups all-purpose flour (156g)
• ½ cup light brown sugar, firmly packed (100g)
• ⅓ cup granulated sugar (66g)
• ¾ teaspoon ground cinnamon
• ¼ teaspoon salt
• Glaze (optional)
• ⅔ cup powdered sugar (85g)
• 1-2 Tablespoons whole milk, plus more as needed