Add the apples and toss until well coated. Sprinkle with lemon juice and add walnuts (if using) and stir again until well-combined.
4-5(1.4kg) large apples peeled, 1 Tablespoon lemon juice, ½ cup chopped walnuts optional
Transfer apple mixture into your prepared baking pan (be sure to scrape out all sugar/juice from the bowl) and dot with butter pieces.
3 Tablespoons salted butter cut into 6 pieces
Cover pan with foil and transfer to 375F (190C) oven. Bake for 60 minutes or until apples are tender when pierced with a fork, stopping every 15 minutes to stir apples.