Space Needle Apple Pie

Ingredients

• Streusel Topping
• 1 cup butter, softened
• 1 1/2 cups all-purpose flour
• 1 1/2 cups brown sugar, firmly packed
• 1 1/2 cups walnuts, coarsely chopped
• Filling
• 3 apples (Granny Smith)
• 3 apples (Rome Beauty)
• 2 tablespoons lemon juice (fresh is best)
• 1/2 teaspoon vanilla extract
• 1/2 cup sugar
• 1/4 cup all-purpose flour
• 1 teaspoon ground cinnamon
• 1/8 teaspoon ground nutmeg
• 2 pie crusts (unbaked)