To make a copycat Mrs. Field's Oatmeal Cookie recipe, start by creaming together 1/2 cup of butter, 1/2 cup of brown sugar and 1/2 cup of regular sugar. Add 1/2 teaspoon of vanilla and an egg and mix well to combine. Grate a 2 ounce Hershey chocolate bar. Place 1 1/4 cups of oatmeal into a bender or food processor and process until powdered. Combine the powdered oatmeal with 1 cup flour, 1/4 teaspoon salt and 1/2 teaspoon baking soda.
Add 1/4 teaspoon baking powder and stir to combine. Add the dry ingredients to the butter and sugar mixture and incorporate. Fold in a 6-ounce bag of chocolate chips and the grated Hershey chocolate bar.
Once the ingredients are combined, portion dough into cookies roughly the size and shape of a golf ball. Place dough on an ungreased cookie sheet. Bake them at 375 degrees Fahrenheit for approximately 6 to 12 minutes.
Preparation time for this recipe is around 22 minutes. It yields 24 cookies, with each cookie containing 143.4 calories, 60 of which are calories from fat. The cookies' total fat is 6.7 grams, with 3.9 grams of saturated fat. They contain 20.4 grams of carbohydrates, 1.8 grams of protein, 91 grams of sodium and 19 milligrams of cholesterol.