Spray an 8-inch square pan with baking spray. Set aside.
Spread pecans on a baking sheet and place in oven for 5-6 minutes, until lightly toasted. Set aside.
Combine bittersweet chocolate and butter in a microwavable bowl.
Microwave for 15-30 seconds at a time, stirring after each, until chocolate is nearly melted. Continue stirring until smooth and chocolate has melted completely. Set aside.
In the bowl of a stand mixer, combine eggs, sugar, and vanilla.
Beat at high speed for 10 minutes.
Slowly mix in the melted chocolate.
Stir in flour.
Pour half of batter into prepared pan.
Top with caramel sauce, chocolate chips, and pecans.
Pour other half of batter over the toppings.
Bake for 35-40 minutes, until they test done.
Notes
Make sure to beat the eggs, sugar, and vanilla for a full 10 minutes.
You may need to cover the brownies with foil to keep from over-browning.
Run a dull knife around the edges of the pan to make sure the brownies release from the sides.
To help determine if the brownies are done, use cake tester! When cutting, the caramel will run out the edges.