3/4 cup unsweetened Dutch-process cocoa powder
3/4 cup hot water
3 cups all-purpose flour
1 teaspoon baking soda
1 teaspoon baking powder
1 1/4 teaspoons coarse salt
1 1/2 cups (3 sticks) unsalted butter
2 1/4 cups sugar
4 large eggs, room temperature
1 tablespoon plus 1 teaspoon pure vanilla extract
1 cup sour cream, room temperature
3/4 cup bacon, cooked and chopped
2 sticks unsalted butter; room temperature
2 teaspoons pure vanilla extract
1 pound confectioners' sugar
1/3 cup pure maple syrup; plus more for drizzling
1 teaspoon salt