All the fun of monster cookies—creamy peanut butter, oats, chocolate chips, and colorful M&M's—made into a safe, no-egg edible cookie dough you can enjoy by the spoonful.
Add the quick oats to a food processor and pulse until very fine, like flour. Optional safety step: spread on a baking sheet and bake at 300°F for 10 minutes, then cool completely.
In a large bowl, beat the peanut butter, softened butter, brown sugar, and granulated sugar until light and creamy, about 2 minutes.
Mix in the vanilla extract and salt until combined.
Add the ground oats and mix on low until the dough looks evenly combined and crumbly.
Drizzle in the milk a little at a time until the dough is soft and scoopable, but not sticky.
Fold in the mini chocolate chips and mini M&M's. Serve immediately or chill 20 minutes for a firmer texture.
Store refrigerated in an airtight container for up to 5 days or freeze up to 2 months. Enjoy by the spoonful or roll into bite-size balls.
Notes
For a gluten-free treat, use certified gluten-free oats. If you prefer a classic cookie dough flavor, substitute 1.5 cups heat-treated all-purpose flour for the ground oats. Adjust milk as needed for a creamy, scoopable texture.