You’ll want to check that your hot end is getting adequate cooling, that your filament is not slipping in the drive gear (where the filament is pushed into the hot end), and that your temperature is set correctly.
Essentially, look to find out where you see indications of this problem higher up in the chain of feeding filament, melting filament, etc. Disconnect the bowden tube, heat up the hot end. Can you push filament through by hand? It should be a little tough, but not overly so. If it’s tough, we gotta figure out what’s going on in the hot end. If it’s not tough to push while at temperature, then it’s gotta be the mechanism that feeds the filament into the hot end.
From there move back and check that your tensioning mechanism on the filament feeder is set tight enough that your filament isn’t slipping but not so tight that it flattens out the filament or gouges it out.