Slice carrots into large pieces and place on the bottom of the crock pot.
Combine chicken, garlic, 1/2 lemon juiced, and all seasonings in a separate bowl and then add on top of carrots.
Top with tomato sauce, cover, and cook on low for 6 hours.
About 30 minutes before serving you can start your basmati rice.
Uncover the crock pot and stir your Chicken Tikka Masala adding more salt to taste if needed. Add the thick coconut milk, peas, chickpeas, and cilantro. Be sure to save some cilantro for garnish.
Let cook uncovered for another 20-30 minutes and once your rice is finished your delicious Tikka Masala is ready to serve!