Put the chicken in a saucepan, cover with salted water and simmer for 15 to 18 minutes until cooked through. Cool slightly and shred finely with two forks.
Heat the olive oil in a skillet over medium heat and cook the onion and garlic for 3 minutes until soft. Add the chicken, season with salt and pepper, and cook 2 minutes. Take off the heat and stir in the requeijão and parsley. Cool completely.
For the dough, microwave the mozzarella and cream cheese together in 30-second bursts, stirring, until smooth. Mix in the almond flour and egg and knead into a smooth dough. Chill for 10 minutes so it is easier to handle.
Divide the dough into 12 pieces. Flatten each into a disc in your oiled palm, add a heaped tablespoon of filling, and pinch the dough up and around it, shaping it into a teardrop with a pointed top.
Dip each coxinha in beaten egg, then roll in the pork rind crumbs, pressing so they stick.
Heat 1 inch of avocado oil in a deep pan to 350°F (175°C). Fry the coxinhas in batches for 2 to 3 minutes, turning, until deep golden. Drain on paper towels and serve warm.