This is my grandmother's recipe.
1 cup butter
1 cup brown sugar (C&H)
1 cup granulated sugar (I usually just use about 1.5 cups brown sugar and no white sugar--C & H brand brown sugar is cane sugar with no additives)
1 teaspoon vanilla (organic vanilla with no corn syrup is usually safe)
1 teaspoon baking soda
½ teaspoon salt
2 cups flour (I use King Arthur’s Unbleached White Whole Wheat Flour)
2 cups rolled oats
1 to 2 cups chocolate chips (Enjoy Life brand chocolate chips are safe)
Cream butter and sugar, add eggs and vanilla. Sift together soda, salt & flour; add to egg mixture. Mix well. Stir in oats. Add chocolate chips.
Bake in 375 degree F oven for 8-10 minutes or until not quite done in appearance. Let cool and finish baking slightly on cookie sheet, then move to cookie rack.