Peanut Butter Oatmeal Cookies

Ingredients

• 1 cup peanut butter, creamy (warmed in the microwave for ~20-30 seconds so it's drippy)
• 1/2 cup dark brown sugar, packed
• 2 Tbsp. whole milk
• 1 large egg, room temperature
• 2 tsp. vanilla extract
• 1 cup old fashioned rolled oats
• 1 tsp. baking soda
• 1/4 tsp. kosher salt
• pinch ground cinnamon
• 1 cup blueberries or chocolate chips