Gooey Caramel Twix Bars

"There's nothing like the flavor of homemade caramel. [Photograph: Yvonne Ruperti Not your average bar cookie. Crunchy Twix bars, pecans, bittersweet chocolate, and a homemade caramel all set over a buttery shortbread crust. Notes: Brushing down the sides of the pan will help prevent the caramel from crystallizing. If one area of the pan begins to brown more quickly, gently swirl the pan to evenly distribute the caramel. Take care when adding the butter and cream to the caramel as it may sputter. About the Author: Yvonne Ruperti is a food writer, recipe developer, former bakery owner, and author of the new cookbook One Bowl Baking: Simple From Scratch Recipes for Delicious Desserts (Running Press, October 2013), and available at Barnes & Noble, IndieBound, Powell's, The Book Depository. Watch her culinary stylings on the America's Test Kitchen television show. Follow her Chocoholic, Chicken Dinners, Singapore Stories and Let Them Eat Cake columns on Serious Eats. Follow Yvonne on Twitter as she explores Singapore. Every recipe we publish is tested, tasted, and Serious Eats-approved by our staff. Never miss a recipe again by following @SeriousRecipes on Twitter!..."