Best Coffee Cake Recipe My Ultimate Cinnamon Streusel

Ingredients

• ½ cup (100g) granulated sugar
• ½ cup (60g) all-purpose flour
• ⅓ cup (30g) packed light brown sugar
• ½ teaspoon ground cinnamon
• ¼ teaspoon salt
• 6 tablespoons (85g) cold unsalted butter, cut into small cubes
• ¼ cup (30g) chopped pecans or walnuts (optional)
• 2 ½ cups (300g) all-purpose flour
• 1 teaspoon baking powder
• ½ teaspoon baking soda
• ½ teaspoon salt
• ¾ cup (1 ½ sticks, 170g) unsalted butter, softened
• 1 ½ cups (300g) granulated sugar
• 2 large eggs
• 1 teaspoon vanilla extract
• 1 cup (240ml) sour cream or plain Greek yogurt