Preheat the oven to 350 degrees. Spray four mini loaf pans with non-stick cooking spray and line the bottoms with parchment paper; set aside.
Beat butter and brown sugar in a mixing bowl till creamy. Add eggs, sour cream, bananas, and vanilla. Beat well.
Whisk together the flour, soda, salt and [i]3/4 cup[/i] of the chocolate chips. Stir lightly into the wet ingredients. Carefully fold in the fresh raspberries.
Divide batter between the four mini loaf pans. Sprinkle remaining chocolate chips over the top of the batter.
Bake at 350° for 35-40 minutes or till lightly browned and toothpick inserted in the center comes out clean. Allow bread to cool 5 minutes in pans, then remove to cooling racks.
Notes
-If you prefer, you can bake in a 9x5" loaf pan. It will take about 60 minutes to bake.