*Note: instructions to cook in a Crockpot or Slow Cooker also included below.
In a medium mixing bowl, add the ground chicken, eggs, yellow onion, garlic, dried oregano, salt, red pepper flakes, pesto, and breadcrumbs. Using two forks, or clean hands, mix until just combined.
Begin to roll the meatballs into 2-tablespoon-sized balls using clean, damp hands. Place on a clean plate and repeat until all meatballs have been rolled.
In a large, tall-sided skillet, heat the olive oil over medium-high heat.
Once hot, carefully place the meatballs in the pan, working in batches if needed.
Cook the meatballs, undisturbed, for 3 minutes, or until a deep, golden crust forms. Flip the meatballs and continue to sear for 2 to 3 minutes per side, until all sides of the meatballs are golden, about 10 to 12 minutes total. The meatballs do not have to be fully cooked through, but they should be golden on all sides. They will finish cooking in the sauce.