Combine the starter, eggs, oil, milk, vanilla extract, and sugar in a bowl. In a separate bowl, combine the flour, cocoa, baking powder, baking soda, salt, pudding mix, both kinds of chocolate chips, and 1 cup caramel bits and make a well in the center. Pour the wet ingredients into the well and incorporate until fully mixed.
Pour into prepared pan and sprinkle remaining ½ cup of caramel bits on top. Bake for 45 minutes to one hour, checking for doneness. When a toothpick inserted in the center of the brownies comes out clean, remove to a rack to cool.