Begin by making the sour milk... Add the vinegar to the milk to sour it, and set it aside to rest while you start mixing the dough.

Pre-heat the oven to 350°F.

Cream (mix) together the brown sugar, pure cane sugar, and softened butter. 

Add the eggs and vanilla extract to your mixture, and mix well.

Stir the baking soda into your sour milk and set aside.

Sift together the dry ingredients, including the all-purpose flour, salt, and ground cinnamon.

Mix the dry ingredients into the creamed mixture, alternating with the sour milk. 

Add the oatmeal and raisins, mixing them in well (this is where you may need to mix by hand). 

Using a cookie scoop, drop cookies onto your cookie sheet, pressing/patting the cookies somewhat flat with your fingers.

Bake for 12 to 15 minutes, or until the cookies turn a nice golden hue. 

When you remove each batch from the oven, remove the cookies from the cookie sheet and allow them to cool on a wire rack.

Serve with a nice tall glass of ice cold milk.