Combine all ingredients except vanilla in a small, heavy-bottomed saucepan over medium-low heat. Stir slowly until caramel has thickened, 10-12 minutes. Remove pan from heat then stir in vanilla and let cool slightly. Can be made up to 5 days ahead of time. Warm for 30 seconds in the microwave before using.
For the Apple Crisp:
Preheat oven to 375 degrees then spray a medium-sized baking dish (like 8x8" or 10x7") with nonstick spray. Add apple slices to a large bowl then toss with cinnamon and 1 Tablespoon flour until well coated. Transfer to prepared baking dish then drizzle 1/2 cup prepared Easy Caramel Sauce on top.
Combine oats, brown sugar, chopped pecans, remaining 1/4 cup flour, salt, and butter in the bowl then use your fingertips to combine mixture until crumbly. Top caramel apples with crisp then bake for 30-40 minutes or until apples are tender and caramel is bubbly. NOTE: If crisp topping begins to brown before apples are tender, place a piece of foil on top (no need to crimp) then continue baking.
Allow Caramel Apple Crisp to cool for 20 minutes — 1 hour before scooping into bowls then topping with reserved Easy Caramel Sauce.