Begin by dicing the onion and mincing the garlic.
In a skillet over medium heat, add 2 tablespoons of olive oil. Sauté the onion and garlic until they are soft and fragrant (about 3-4 minutes).
Place the chicken breasts in the bottom of the crockpot.
Add the sautéed onion and garlic on top of the chicken.
Pour in the chicken broth and add the mixed vegetables.
Sprinkle the dried thyme, dried rosemary, salt, and pepper over the top.
Stir gently to combine all ingredients without disturbing the chicken too much.
Cover the crockpot and cook on low for 6 hours or until the chicken is cooked through and shreds easily.
If you desire a thicker stew, remove 1 cup of liquid from the crockpot, stir in 2 tablespoons of flour until smooth, and then pour back into the crockpot.
Stir well and let it cook for an additional 30 minutes.
Serve hot in bowls, and enjoy your hearty meal!