Now Rosie's adding ninja posting to her vast repertoire!!!

Sounds like your Mom cooked like my Mom most of the time!
I will double check the recipe for temperature, but if I remember correctly it is as follows:
2/3 stick of butter (or margarine, but I prefer the butter - the recipe actually says it in tablespoons - 5 and 1/3 maybe, but I know you can get three batches from 2 sticks)
Preheat oven to 350 degf (have to check, it might be 325)
Melt butter in 13x9 pan while oven is preheating
(When butter is melted, I usually shake it around in the pan and try to get it as even as possible) Then quickly sprinkle in one cup of graham cracker crumbs, making sure they are also spread evenly on the bottom of the pan
Then
in order, add one cup EACH of semi-sweet morsels, butterscotch morsels (I usually combine the two in a container and shake them up so they are mixed a little more evenly), Baker's flaked coconut and chopped pecans. Then pour a can of Eagle Brand Sweetened Condensed Milk over the top. I start right along the edge of the pan because if you get the edges cooked right you are pretty certain that the whole thing will be cooked and hold together pretty well. Have a scraper handy because you will pretty much need every drop you can get out of the can.
Bake for 30 minutes. Adjust time a little shorter if you use a dark/teflon pan instead of aluminum or glass, and also depending on your stove (as in my Mom's)

and where you are versus sea level (as you would for pretty much anything else). I usually check them at about 25 minutes to see if the middle is starting to get slightly brown, which is when I take them out.
Loosen edges when you remove from stove. Let them cool in the pan, then slice and serve.
As you can tell by suggestions about the butter, graham cracker crumbs, distribution of the morsels and pouring the condensed milk, I am very OCD about how I make them.

I've had some I don't think were done with as much TLC and they just don't taste the same to me.

I'm actually sharing my little secrets right here for the first time just for you Rosie!!!
