Easy Apple Crumble Pie

INGREDIENTS

sheet frozen pie crust, thawed per package instructions (or your favorite pie crust recipe)

large granny smith apples, about 6-7 cups

Zest of 1 lemon, about 1-2 teaspoon

Juice of half a lemon, about 2 teaspoons

1/2 cup

granulated sugar

1/4 cup

packed brown sugar

2 tbsp

all-purpose flour

1 1/2 tsp

cinnamon

1/2 tsp

nutmeg

1 cup

rolled oats

1/2 cup

packed brown sugar

6 tbsp

all-purpose flour

1 stick

cold butter cut into small pieces