01 -
Preheat the oven to 350°F. Grease and flour a 9×13-inch baking pan.
02 -
In a medium bowl, whisk together 2 cups all-purpose flour, baking powder, baking soda, salt, and 1 teaspoon ground cinnamon. Set aside.
03 -
In a large bowl, cream softened butter with granulated sugar until light and fluffy. Add eggs one at a time, mixing well after each addition. Incorporate vanilla extract.
04 -
Gradually add dry ingredients to the butter mixture, alternating with buttermilk. Mix until just combined. Gently fold in diced apples.
05 -
Spread the batter evenly into the prepared baking pan.
06 -
In a small bowl, combine 3/4 cup flour, brown sugar, and 1/2 teaspoon ground cinnamon. Stir in melted butter until mixture forms coarse crumbs.
07 -
Sprinkle the crumb mixture evenly over the batter.
08 -
Bake for 35 to 40 minutes or until a toothpick inserted in the center emerges clean.
09 -
While baking, whisk together powdered sugar, milk, and 1/2 teaspoon ground cinnamon in a small bowl until smooth.
10 -
Allow the cake to cool in the pan for 10 minutes. Drizzle with cinnamon glaze before serving. Serve warm or at room temperature.