Apple Crumb Cake

Ingredients

• FOR THE CRUMB TOPPING:
• 5 Tablespoons Butter
• 1/2 cups Sugar
• 1/2 cups Flour
• 1/4 teaspoons Salt
• 1/2 cups Walnuts, Chopped
• FOR THE CAKE:
• 2 cups Flour
• 2 teaspoons Baking Powder
• 1/2 teaspoons Baking Soda
• 1/4 teaspoons Salt
• 1/4 teaspoons Ground Cinnamon
• 8 Tablespoons Butter
• 1 cup Sugar
• 2 whole Eggs
• 2 teaspoons Vanilla Extract
• 1/2 cups Yogurt
• 1 whole Apple, Peeled, Cored And Diced