Preheat the oven to 350 degrees Fahrenheit.
Mix the ingredients together with a fork. It will be a little chunky, and that is okay.
1 stick of butter, 1 cup of brown sugar, 1 cup of quick cooking oats
On a parchment-lined baking sheet, spread half the mixture.
Bake the mixture for 8 minutes, but keep an eye on it. All ovens cook differently and you don't want it to burn.
Transfer the mixture (it will be in chunks) to a paper towel-lined plate. Let it cool completely and then break it apart into bite-sized pieces.
Repeat with the second half of the mixture.
After the muddy buddies and streusel topping have cooled completely, combine them and transfer to a container that can be completely sealed. Best when eaten within two days.