Preheat oven to 350°F (175°C). Coat a 9″x 13″x 2" baking pan with cooking spray. Line with parchment paper, leaving about a 2-inch overhang on the short ends.
In a large bowl, stir together the oats, flour, brown sugar, baking soda, and salt. Mix in the butter, using a pastry blender, a fork, or your fingers, until the mixture resembles coarse meal. Press half of the mixture onto the bottom of prepared pan.
Bake the crust until just set and starting to brown around the edges (about 20 minutes). Cool in the pan on a wire rack for 5 minutes.
While the crust is baking, cook the caramels and cream in a small saucepan over medium heat. Stir occasionally, until the caramels are melted. Remove from the heat and let cool slightly.
Sprinkle the partially baked crust with chocolate chips. Drizzle the caramel mixture over the chocolate chips and crust. Crumble the remaining crumb mixture on top.
Bake 20-25 minutes, or until pale golden brown.
Cool completely in the pan before cutting into bars.