Spray 4-quart slow cooker with nonstick cooking spray.
Season chicken, if desired, with salt and ground black pepper. Melt Country Crock® Calcium plus Vitamin D in large nonstick skillet over medium-high heat and brown chicken, stirring occasionally, about 4 minutes. Remove chicken to slow cooker.
Stir salsa, peanut butter, red pepper, onion and Knorr® Chicken flavored Bouillon Cube(s) into slow cooker. Cook covered on HIGH 3 to 4 hours or LOW 6 to 8 hours. Stir in lime juice and garnish, if desired, with chopped fresh cilantro. Serve, if desired, over hot cooked rice.