Place the sliced apples into your slow cooker and sprinkle with cornstarch. Toss gently to coat each slice evenly.
Stir in brown sugar, granulated sugar, and cinnamon until the apples glisten.
Pour in the melted butter, lemon juice, and vanilla extract. Stir once more so everything blends beautifully.
Cover and cook on HIGH for 2 hours. Your kitchen will smell like a Cracker Barrel bakery by the end.
Stir before serving warm. The sauce will thicken slightly as it cools, creating that luscious syrupy texture everyone loves.
