Preheat Oven: Preheat oven to 356ºF (180ºC).
Line Tin: Line an 8x8-inch (20cm x 20cm) square baking pan with parchment paper, leaving some overhang on the sides for easy removal.
Blend Ingredients: Place flour, sugar, and butter into a food processor. Blend until mixture resembles a loose crumb.
Press: Firmly press crumb mixture into lined pan using the back of a spoon or flat-bottomed cup.
Bake Base: Bake for 20 minutes until edges are lightly golden.
Rest Base: Remove from oven and let sit for 5 minutes while preparing the topping.
Prepare Apples: Peel, core, and slice apples into even wedges.
Combine Ingredients: In a medium pot, add butter, brown sugar, maple syrup, and cream.
Warm Mixture: Place over low heat until butter melts, stirring occasionally. Do not allow to boil.
Boil: Increase heat to high and bring mixture to a boil. Boil for 2 minutes, stirring to prevent burning.
Add Apples: Turn off heat and stir in sliced apples (and a pinch of salt if desired).
Spread Topping: Pour evenly over pre-baked base.
Add Oats: Sprinkle oats over the apples.
Bake Again: Return to oven and bake 25–30 minutes until topping bubbles and turns golden.
Cool: Remove from oven, cool in pan for 1 hour.
Slice: Lift out using parchment overhang, transfer to rack, cool completely, and slice into bars.