Double-Caramel Turtle Cake

INGREDIENTS

• Cooking spray
• 1 tablespoon all-purpose flour
• 1 1/2 cups boiling water
• 3/4 cup unsweetened cocoa
• 1 1/2 cups granulated sugar
• 6 tablespoons butter, softened
• 1 teaspoon vanilla extract
• 2 large eggs
• 1 2/3 cups all-purpose flour (7 1/2 ounces)
• 1 teaspoon baking soda
• 3/4 teaspoon baking powder
• 1/4 teaspoon salt
• 2 tablespoons butter
• 1/4 cup packed dark brown sugar
• 2 to 3 tablespoons fat-free milk
• 2 teaspoons vanilla extract
• 2 cups sifted powdered sugar
• 2/3 cup fat-free caramel apple dip (such as T. Marzetti's)
• 1/4 cup finely chopped pecans, toasted