i outlined a simple way earlier.
okay. you wake up. you do cardio. you just burned a bunch of body fat. lets say you burn 400-600 calories of body fat.
now lets say your bmr is 3000 cals a day. you eat 3300 cals for that day. of the right macronutrients of course.
now, your not gong to store any fat from eating 300 calories over each day, protein synthesis is very costly.
and even if you did store some fat, the most would be 300. but you burned a the loswest 400 cals in cardio
so worst case scenario each day you only lost 100 calories of fat.
and at the same time, you gaining muscle because you eating 300 cals over bmr.