1. Place the sliced onions in a thin layer on the bottom of the slow cooker. Scatter the baby carrots on top.
2. Mix together the mustards, honey, curry powder and cayenne together in a bowl. Brush half of the mixture onto the chicken breasts and place the poultry on top of the onions and carrots. Top with the red peppers.
3. Mix the water into the remaining honey mustard mix. Pour over the peppers.
4. Cook on high for 3 1/2 to 4 hours.