Preheat oven to 350F. Melt butter and brown sugar in microwave. Cool about a minute. Add eggs and vanilla. Beat eggs lightly before mixing. Mix into cake mix. Add chocolate chips. Add nuts. Batter is very thick. Spread on a cookie pan sprayed with vegetable cooking spray. Bake 20-25 minutes. Cool briefly, but cut into squares while still warm.
Cajun Country -- New Iberia, Louisiana