Preheat the Oven:

Set oven to 400ºF (200ºC).

Prepare the Seasoning:

In a small bowl, mix paprika, cumin, salt, and chili powder. Set aside.

Make the Stuffing:

Roughly chop baby spinach.

In a mixing bowl, combine spinach, cream cheese, feta, and mozzarella. Massage the mixture with your hands until it forms a thick, uniform paste.

Stuff the Chicken:

Slice a deep pocket into each chicken breast without cutting all the way through.

Divide the stuffing into 4 parts and fill each chicken breast.

Secure the pocket with toothpicks to prevent cheese from oozing out during baking.

Season and Bake:

Brush the chicken on both sides with olive oil and rub in the seasoning mix.

Place on a baking sheet or dish and bake uncovered for 25–30 minutes (internal temp should reach 165ºF/74ºC).