Preheat oven to 350ºF (177ºC). Line an 8X8-inch baking dish with parchment paper or aluminum with a 2-inch overhang on both sides.
In a large mixing bowl, add flour (1 cup), baking soda (1/2 teaspoon), oats (1 cup), brown sugar (3/4 cup), salt (1/8 teaspoon), vanilla (1 teaspoon), and melted butter (3/4 cup) to the bowl. Stir until combined. The dough will be crumbly.
Divide the dough in half, pressing one half of the dough into prepared 8" x 8" pan.
Bake for 10 minutes in the preheated oven, set aside to cool for 10 minutes.
While crust is baking, melt the caramel squares (10 ounces) and heavy cream (1/3 cup) in the microwave for 2 minutes on 50% power. Stir caramels and cream until smooth and completely melted. Return to microwave at 30-second intervals at 50% power until completely melted and caramel is smooth when stirred. Set aside to let cool and thicken.
Sprinkle chocolate chips (1 1/4 cups) and pecans (1/2 cup) over slightly cooled crust.
Spread cooled, melted caramel sauce over chocolate chips and pecans.
Break the remaining dough into small pieces then lay the pieces in a single layer over the caramel, chocolate chips, and pecans.
Bake in the preheated oven for 15-18 minutes, or until golden brown on the top. Let Caramelitas cool before cutting.