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Preheat oven to 375 degrees and grease an 8.5x11 baking dish (or a baking dish that holds 2 quarts).
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In a large bowl, combine chopped apples, cranberries, granulated sugar, vanilla extract and lemon juice. Stir to combine. Allow to sit for 5 minutes.
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In a separate bowl, mix oats, brown sugar, flour, and cinnamon together. With a pastry cutter or a fork, cut in the butter until the mixture resembles coarse crumbs.
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Pour fruit mixture into casserole dish in an even layer. Spread the crumble even over the top of the crisp.
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Bake for 35-40 minutes, or until the fruit is tender and the topping is golden brown.
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Serve with ice cream or whipped cream, if desired.
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Enjoy!