Preheat your oven to 350°. Spray a 9x13-inch pan with cooking spray and line with parchment paper. Spray the sides of the parchment as well.
Mix together flour, oats, brown sugar, soda, salt, and melted butter in a mixing bowl till crumbly.
Press half of the dough into the prepared pan. Bake at 350° for 10-12 minutes.
While the crust is baking, combine the caramels and cream in a glass bowl. Melt in the microwave, stirring often until smooth.
Remove the crust from the oven and sprinkle with chocolate chips and pecans. Drizzle the melted caramel mixture evenly over the top. Sprinkle the remaining oat mixture over the top of the caramel. It's OK if some of the filling is showing.
Return to the oven and bake for 20-25 more minutes or till golden brown and bubbly. After 15-20 minutes, use a greased butter knife or spatula to loosen any stuck caramel from the sides of the pan.
Cool completely before cutting into bars using a sharp knife.
Notes
I like to use Werther's soft caramels for this recipe because they taste the most like homemade caramels.
You can use thick caramel sauce in place of the melted caramels and cream. You will need about 2 3/4 cups of caramel.
Leftover bars can be stored in an airtight container at room temperature for up to a week.