I don't know the actual source for these. My husband used to make them when he worked in a coffee shop.
2 1/2 cups quick-cooking oats (I've used regular and it was fine)
2 1/4 cups flour
3/4 cup white sugar
3/4 cup brown sugar
1 1/2 cups chopped walnuts, divided
1 1/2 tsp. baking soda
1 tsp. salt
12 Tbs. cold butter, cut in pieces
2 tsp. vanilla, divided
1 can (5 oz.) evaporated milk
3 Tbs. butter
2 Tbs. dark corn syrup (I've used light and it's fine)
2 1/2 cups chocolate chips
1. Preheat oven to 350°F. Grease a 10 X 15 inch pan (I've used a 9 X 13).
2. Combine oats, flour, sugars, 3/4 cup of the walnuts, baking soda and salt. Cut in the cold butter pieces with a pastry cutter or 2 knives until the size of peas. (Don't use a FP - it'll pulverize the oats. You can just use your fingers and smush the dough between them.)
3. Add eggs and 1 tsp. of vanilla and mix by hand until mixture just begins to hold together. Do not over mix.
4. Press half the dough onto the bottom of the baking pan.
5. Heat milk, 3 Tbs. of butter, and corn syrup together. When milk boils, turn heat off, add chocolate chips and stir until smooth. Stir in remaining 1 tsp. of vanilla and 3/4 cup walnuts (I usually omit these nuts).
6. Smooth chocolate mix over pressed dough; crumble remaining dough evenly over surface and press it lightly into filling. Bake 20 minutes. Cool, cut and serve.
Source of recipe: Deanna