Caramel Apple And Walnut Coffee Cake For Baketogether

Ingredients

• 2/3 cup (4 5/8 ounces) firmly packed dark brown sugar
• 3/4 cup ( 3 3/8ounces) all purpose flour
• 1 1/2 teaspoons ground cinnamon
• 3/4 cup coarsely chopped walnuts
• 4 tablespoons unsalted butter, melted and cooled
• 2 cups (9 ounces) all purpose flour
• 1 1/4 teaspoon baking soda
• 3/4 teaspoon ground cinnamon
• 1/2 teaspoon freshly grated nutmeg
• 1/2 teaspoon table salt
• 8 tablespoons (4 ounces) unsalted butter, softened
• 1 1/4 cups (8 3/4 ounces) firmly packed light brown sugar
• 1 teaspoon pure vanilla extract
• 2 large eggs, at room temperature
• 1 cup yogurt, at room temperature
• 3 baking apples, peeled, cored and sliced; divided
• 1 tsp of butter
• caramel sauce, purchased or see link after recipe for espresso caramel sauce