Mix brownie mix according to package directions. Put in a 9x13 inch pan and bake 20 minutes at 350 degrees F. Remove from oven and spread with coconut and evaporated milk mixed together. Return to oven and bake 20 minutes. Cool and frost with ready to spread frosting.
I was under the impression that Eagle Brand is a sweetened condensed milk, not an evaporated milk. The consistency is quite different, as is the flavor. Does Eagle Brand also make an evaporated milk, or does your recipe call for sweetened condensed milk?