Preheat your oven to a warm 350°F (175°C) while you butter up a 9x13-inch baking pan for non-stick bliss.
In a spacious bowl, whisk together the heartwarming melted butter, oats, flour, sugar, baking soda, salt, and vanilla to form a crumbly yet cohesive mixture.
Firmly press half of this fragrant oat mixture into your prepared pan, laying the groundwork for what’s to come. Give it a quick bake for about 10 minutes until just set.
Sprinkle the chocolate chips and optional nuts over this pre-baked base, then lavish it with the golden caramel sauce. This is the layer that crowns the caramelitas with its sticky sweetness.
Crumble the remaining oat mixture over the caramel, covering it like a blanket of crumbly goodness.
Bake for another 15-20 minutes, until the edges are a toasty golden hue, and the center bubbles with caramel joy.
Patience, now—let the pan cool completely. This pause is crucial; it’s what turns a pan of baked ingredients into firm, sliceable bars of heaven.