Begin by preparing all your ingredients. Dice the onion, mince the garlic, and chop the mixed vegetables into bite-sized pieces.
In the crockpot, lay the chicken breasts evenly across the bottom.
Drizzle the olive oil over the chicken breasts, then season with salt, black pepper, and dried Italian herbs.
Spread the diced onion and minced garlic evenly over the chicken.
Add the mixed vegetables on top of the chicken and onion layer.
Pour the chicken broth over everything in the crockpot. Make sure the liquid covers the bottom of the pot.
Cover the crockpot with the lid, set to low heat, and cook for 6 hours. For a quicker option, cook on high for about 3 hours.
Once the cooking time is complete, use a meat thermometer to ensure the chicken reaches an internal temperature of 165°F (75°C).
Carefully remove the chicken breasts and let them rest for a few minutes before slicing.
Serve the chicken with the vegetables and broth spooned over the top.