Creamy Apple Crumb Pie | Reader's Digest Canada

Ingredients

• Pastry for single-crust pie (9 inches)
• 1/3 cup sugar
• 3 tbsp cornstarch
• 1 tsp ground cinnamon
• 1/4 tsp ground allspice
• 6 cups diced peeled tart apples (about 6 medium)
• 1 cup reduced-fat sour cream
• 1 tsp vanilla extract
• 1/2 cup all-purpose flour
• 1/4 cup packed brown sugar
• 1/2 tsp ground cinnamon
• 2 tbsp cold butter
• 2 tablespoons cold butter