Preheat oven to 375°F (190°C). Grease a 12-cup muffin tin with non-stick spray or butter.
- In a medium saucepan, melt butter over medium heat. Add diced apples, sugar, cinnamon, and lemon juice. Cook for 5-7 minutes until apples are soft but hold their shape. Remove from heat and set aside.
- In a small saucepan, combine heavy cream, butter, brown sugar, and salt. Simmer over medium heat for 3-4 minutes until slightly thickened. Stir in vanilla extract and remove from heat.
- Roll out pie crust and cut out 12 circles (about 3 inches in diameter). Press each circle into the muffin tin.
- Spoon apple filling into each pie crust, pressing lightly. Add a small piece of butter on top of each filled cup.
- Bake for 18-22 minutes until the crust is golden and apples are bubbling. Let cool for 5-10 minutes in the tin, then transfer to a serving platter.
- Drizzle with warm caramel sauce before serving. Enjoy!