Line a large cookie sheet with wax paper or parchment paper.
Next, add sugar and flour together in a medium-sized saucepan. Stir until well combined.
Add butter and milk and turn the burner on to medium-high heat. Stir fairly constantly as the butter melts, bring to a full boil, and allow to boil for 2 minutes. (Keep stirring while boiling.)
Remove from heat and add peanut butter and vanilla. Stir until combined, and then add quick oats and stir until completely combined.
Next, using a cookie scoop or by the tablespoonful, drop cookies onto the prepared cookie sheet with wax paper or parchment paper to cool.
Let cool and enjoy.
Recipe by Real Life Dinner at https://reallifedinner.com/blondie-no-bake-cookies/