Taking a few of my favorite flavors and making a very simple crust that involved no rolling was what this recipe was. I have made this with just lemon zest and juice with the apples, then also added in some orange zest and it was a hit! I also sometimes put the apple pie spice into the crust mixture. Really makes a difference when you just want a hint of flavor.
Peel, core, and dice 3 cups (about 4 apples) of tart apples. Place these into a bowl and squirt some lemon juice on top to keep them from turning brown.
Combine flour, brown sugar, oats and zest. Slowly add in melted butter and mix well. Set aside 1 cup for topping and 1 tbsp butter to dollop on top. Press remaining crumb mixture into a lightly sprayed 9-in. pie plate and set aside.
Combine sugar, lemon juice, cornstarch and water in a saucepan until smooth; bring to a boil. Cook and stir with a whisk for 1-3 minutes or until thickened. Remove from the heat and stir in apples, zest, apple pie spice and vanilla. Pour into crust; top with reserved crumb mixture and dollop with the 2 tbsp on top of crust. Bake at 350° F for 40-45 minutes or until crust is golden brown