Directions
Season the chicken breasts on all sides with kosher salt, black pepper, and Italian seasoning.
In a large cast-iron skillet, melt 1 tablespoon (15 ml / 0.5 fl oz) of butter over medium-high heat.
Place the seasoned chicken in the hot skillet and sear for 4-6 minutes per side, until a rich, golden-brown crust forms.
Transfer the seared chicken to your slow cooker.
Scatter the lemon zest, minced garlic, and the remaining 5 tablespoons (75 ml / 2.5 fl oz) of butter (cut into pieces) over the chicken.
Pour the fresh lemon juice on top.
Cover and cook on LOW for 4 hours or on HIGH for 2 hours, until the chicken is tender and cooked through.
In a separate bowl, whisk together the half-and-half, heavy cream, and optional chicken base until smooth.
Pour the cream mixture into the slow cooker and stir gently to combine with the cooking liquids.
Cover and cook on HIGH for an additional 30-60 minutes, or until the sauce has warmed through and slightly thickened.
Serve immediately, spooning the extra sauce over the chicken.
Don't skip the sear!
Searing the chicken before slow cooking creates a deep, caramelized flavor in both the chicken and the final sauce.