Add chicken, red peppers, potatoes, and onions to the slow cooker.
In a medium bowl whisk together chicken broth, curry powder, curry paste, cumin, salt, and cayenne pepper. Pour mixture into slow cooker and stir to coat chicken and veggies. Cover and cook on high for 2-3 hours or on low 4-5 hours.
Remove the chicken and shred with 2 forks; return chicken to crock pot. Stir in coconut milk and cornstarch slurry and turn crockpot to high. Cook until thickened and bubbly; 30-45 minutes.
Top with cashews and freshly chopped cilantro.