Heat flour in a microwave safe container on high power for 1½ minutes. Whisk out the clumps. (Do not skip this step, raw flour can contain dangerous bacteria).
In a large mixing bowl combine, peanut butter, light brown sugar, white granulated sugar, butter, vanilla extract and heavy cream. Use an electric mixer (hand mixer or stand mixer) on medium-high speed and blend until light and fluffy.
Add the oats and flour to your bowl and continue mixing on medium-low speed until everything is well combined. Fold in the M&M's, chocolate chips, and pretzels with a spatula.
Notes
Calories are automatically generated. For best results calculate based on your exact ingredients.