Preheat oven to 375. Steam or slow cook your plain chicken breasts and shred the meat once its done. (Hack: If you want to skip this step, buy a rotisserie chicken and shred it. It likely wont yield as much chicken though!)
Dice your red pepper, yellow pepper and onion. The smaller the pieces the better.
Spray a skillet with non stick and add your chopped goodies on medium heat. You want these to cook down until they are translucent. Depending on the size of your pieces and stove top, this could take up to 20 minutes. If you find that they are sticking or drying up, add in the chicken broth little at a time. Make sure to scrape the pan for all those yummy black bits.
Once you have cooked down your veggies, add in the salt, garlic and tomato paste. Mix well.
Remove pan from heat and add in your shredded chicken to the veggie mixture. Let it cool down for 20 min.
Line a sheet pan with parchment paper to start filling your empanadas. Grab an empanada disc and place about 2 TBS of filling in the center. It's easier if you kind of cup your hand.
Fold dough over and crimp the sides with a fork to seal it.
Grab your egg and whisk it in a bowl. Brush the top of the empanada with your egg wash so it has a nice yellow hue to it
Bake at 375 for 35 minutes