Apple-Pie Crumble Cake

Ingredients:

2 ½ all-purpose flour
1 ¼ brown sugar
3 teaspoon cinnamon (divided)
10 ounce cold unsalted butter (cut into ½-inch cubes)
3 pound crisp, tart apple (such as Granny Smith)
½ cup granulated sugar
2 tablespoon corn starch

Directions: