Add your cleaned chicken thighs to your crockpot and sprinkle all of the seasonings evenly over the chicken.
Once you add all of your seasonings, use clean hands or tongs to mix the chicken in with the seasoning to ensure each piece is coated well.
Now add your garlic cloves directly into the crockpot, then place the sliced pieces of butter right over the top.
Zest the outside of a lemon, careful not to go too deep into the rind (it will taste bitter). You want about 1 teaspoon of lemon zest total. Now cut the lemon into slices and place it directly onto the chicken.
Gently pour the chicken broth around the outer edges of the crockpot, so you don’t completely wash away the seasoning.
Place the lid on the slow cooker and cook it on high for 4 hours, or low for 6-8 hours. Make a corn starch slurry by mixing the corn starch with about ¼ cup of the cooking liquid in a separate cup or bowl.
Once the corn starch is blended completely with the liquid, and there are no more clumps, pour the liquid back into the crockpot and gently mix it into the juices to make a little gravy. Serve over a bed of mashed potatoes or rice, and enjoy!