Here is my recipe for Death by Chocolate. It doesn't have chocolate morsels but I'm sure that you could add them (maybe 1/2 to 1 cup or so).
Nancy

DEATH BY CHOCOLATE

1 (19.8 oz) family size fudge brownie mix
1/4 to 1/2 cups Kahlua or coffee liquer (may substitute mix of 1 tsp. sugar and 4 Tbsp. leftover coffee)
3 (3.5 ounce Jello chocolate mousse (I've used Knorr)
8 (1.2 to 1.4 oz) Skor or Heath candy bars
1 (12 oz.) container Cool Whip, thawed

Bake brownies according to package directions. Cool. Punch holes in top with fork. Pour Kahlua over and set aside.

Make mousse according to package directions.

Break candy bars into small pieces in processor or with mallet in wrapper.

Crumble half of soaked brownies and place in glass trifle dish. Cover with half mousse, layer with half candy, then add 1/2 whipped topping. Repeat layers.