I made the following recipe (gleaned from reddit, see credit below) with the recommended change of upping the berry crunch to 5% in lieu of captain cereal. My additional changes (to change it into fruit loops) are in the [ ]:
The Crunchbaron v1 by /u/returnity on reddit (crunch berry)
Berry Crunch (TFA) - 4%
Captain Cereal (TFA) - 1.5% (sub FA Cookie 0.75% or bump BC to 5%)
Yellow Cake (FW) - 1%
Vienna Cream (FA) - 1%
Orange Cream (TFA) - 0.5% [used cap creamsicle]
Strawberry Ripe (TFA) - 0.75%
Hazelnut (FW) - 1.5%
Meringue (FA) - 2%
Marshmallow (FA) 1%
[added 2 fa Orange + 0.5 fa Bergamot + 2.5 fe Lemon) to approximate fruit circles flavor
After a few days it wasn't impressive, but after 7 or 8 days, the berry crunch flavor got much more interesting.