In a small bowl add the mozzarella and cheddar cheese with the marinara sauce and mix. With the help of a blender or food processor blend the cheeses and sauce until you get a chunky mix.
Add 2 tablespoons of the cheese mixture on one side of the empanadilla disk and fold the dough to a little more than half of the disk. Press down in that seam to seal the filling in. Repeat this for all 10 disks.
Lightly wet your fingers and press down on the border of the dough. Take half-inch pieces and fold them in to make a braid with the dough. Repeat this step to all empanadillas.
Add oil to a large pan over high heat. Cook empanadillas for 2 minutes on each side or until golden brown. Remove from oil to drain onto a paper towel or cooling rack.
Notes
Substitutions:
Fresh homemade or pre-made frozen dough are both fine to use.
You can use any blend of cheeses you like or change up the sauce to a white one.
Additions:
You can add any meat you like. Popular choices are pepperoni, sausage, bacon, or ground beef.
You can add veggies but cook them before to ensure they're tender.
Tips:
Don't overstuff the empanadilla because the cheese can ooze out or it can rip through the middle.
Working at room temperature makes it easier to shape the braid border.