Apple Crumble Pie - VeryVera

Ingredients

• 6 to 7 cups granny smith apples, peeled, cored, and sliced
• 1 pie crust
• 1 c sugar
• 1/4 c all-purpose flour
• 1 tsp. cinnamon
• 1/4 tsp. salt
• 1/2 c unsalted butter, melted
• 1 c brown sugar
• 3/4 c all-purpose flour
• 3/4 c rolled oats