In the top of a double boiler, over simmering water, combine butter, chocolate chips, sweetened condensed milk and corn syrup. Cook over the simmering water, stirring only occasionally, until smooth (about 20 minutes).
Remove from hot water and beat with an electric mixer until smooth.
Preheat oven to 325. Beat all cake ingredients together with a mixer on medium-high until smooth. Pour into a greased and floured 9"x12"x2" inch baking pan or a 10" baking tin. Bake at 325º for 35 minutes or until tester inserted in the center of the cake comes out clean. Let cool on wire rack.
While the cake is in the oven, prepare the frosting.
Source: Gloria Pitzer's Secret Recipes Newsletter
Bill Knapp's was an American family restaurant chain. The menu included a limited breakfast, sandwiches, baskets, luncheon and dinner plates and a children's menu, featuring meals named for animals. Recipes for their fried chicken, bean soup, vegetable soup, onion rings, au gratin potatoes, and chocolate cake (later purchased by Awrey Bakeries) were also featured.It was founded by Clinton B. Knapp (March 13, 1907 – October 15, 1974), in Battle Creek, Michigan in 1956. The chain operated in Michigan, Ohio, Florida, and Indiana, with more than 60 locations at its peak.
After a revamp of the chain's core business model in the early 2000s, the restaurant chain filed for bankruptcy in 2002 and was shuttered.
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