I haven't seen a can in years! I was at a big Safeway but I only looked near the ice cream... it's not my usual store to shop at. I've seen it in the vertical squeeze bottles, and this time it was in one of those upside down squeeze bottles. It said 15 oz but it was just slightly over 1 cup when I measured it. My brownies turned out good so maybe the amount of syrup is not critical but DH remembered them as being more dense than they were. when I make them again I may try the larger amount and see if there's a difference.
I threw a couple other variables in there too. the syrup was "extra chocolatey" type and the only 15x10 pan I had was an insulated one. so baking time was longer. Thanks everyone for your input.
"If the world were a logical place, men would ride side saddle." Rita Mae Brown