Combining the Base Ingredients: In a large saucepan, combine the unsalted butter, granulated sugar, and milk. Place the saucepan over medium-high heat.

Heating Process: Bring the mixture to a boil. Once boiling, maintain the boil for a full minute to ensure proper consistency and flavor development.

Flavor Infusion: Remove the saucepan from the heat. Stir in the vanilla extract, a pinch of kosher salt, and the butterscotch morsels. Continue stirring for approximately 1 to 2 minutes. Note that the butterscotch morsels may not fully melt, which is acceptable.

Incorporating Oatmeal: Fold in the quick-cook oatmeal, ensuring that it is evenly distributed within the mixture. The oatmeal should be completely coated with the butterscotch mixture.

Forming the Cookies: Utilize a large cookie scoop, equivalent to 2 tablespoons, to portion the mixture. Place each portion onto a sheet of parchment paper.

Setting and Cooling: Allow the cookies to set and cool at room temperature for approximately 15 minutes. This step is crucial for achieving the desired consistency and texture.

Storage: Once cooled, the cookies should be stored in an airtight container to maintain freshness. Store at room temperature to preserve the texture and flavor.