Good-Cooking - Toffee Treasure Cake

Ingredients

• 1 teaspoon cinnamon
• 1/4 cup granulated sugar
• 4 to 5 Heath bars, smashed into bits
• 1/4 cup chopped nuts (pecans or walnuts)
• 2 cups flour
• 1 1/2 teaspoons baking powder
• 1 teaspoon baking soda
• 1/4 teaspoon salt
• 1/2 cup softened unsalted butter, cut into small cubes
• 1 cup granulated sugar
• 2 eggs
• 1 (8 ounce) container sour cream
• 1/4 cup unsalted butter, melted (for crumble)