Caramel Apple Snacking Cake

Name: Caramel Apple Snacking Cake
Ingredients: 1 cup (125 g) all-purpose flour; 1 tsp. baking powder; 1 tsp. baking soda; 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt, plus more; ½ tsp. ground cinnamon (optional); ½ cup (1 stick) unsalted butter, divided; 1 cup (200 g) light brown sugar, divided; ½ cup (100 g) granulated sugar; 1 tsp. vanilla extract; 2 large eggs; 3 large apples, preferably Granny Smith, peeled, grated on the large holes of a box grater; ¼ cup heavy cream; Flaky sea salt