Neither English nor toffee, Gram's cookies were always my favorite of her cookie assortment. It's a brown sugar cookie bottom covered in chocolate and (optional) nuts. (I don't do the nuts because I don't like them.)
1 stick butter or margarine
1/2 cup vegetable shortening
1 cup brown sugar
3 egg yolks
1/2 tablespoon vanilla
2 cups sifted flour (sift it and then measure)
a whole bunch of chocolate. For me, it was 2 10-ounce bags of bittersweet chocolate chips. For Gram, it was 12 Hershey bars.
First, cream the butter, shortening, brown sugar, egg yolks and vanilla together. Add the flour. Press this dough into a jelly roll pan or small cookie sheet. Mine was 10.5"x15" I think. Bake at 375F for 10 minutes.
Once you remove the dough from the oven, put your chocolate on it immediately. As the chocolate melts, spread it around with a spatula. (For the chips, I returned it to the turned-off oven for about 2 minutes and then spread things around.) At this point, if you want nuts, sprinkle them on top of the chocolate. I don't.
Cool completely and cut into squares.