Cut chicken breasts into large chunks and place into the slow cooker. You should have about 7 chunks per breast.
In a small pot over medium heat, add in the butter. Melt the butter and briskly whisk in the flour until a thick paste forms. Continue to stir for about a minute. Slowly stir in the organic chicken broth whisking constantly until smooth. Then, whisk in the milk stirring constantly. Reduce the heat to low and allow to simmer and thicken about an additional minute.
Remove pan from heat and stir in the seasonings of pepper, salt, dried oregano, dried thyme, garlic powder, onion powder until combined.
Pour the thickened mixture in with the chicken and stir everything together.
Cover the slow cooker and cook on High for 2 hours or Low for 4 hours or until chicken is cooked through (165°).
Cube the cream cheese and add to the slow cooker. Allow the cream cheese to melt over the chicken. Add in the sour cream and stir until completely combined. Serve hot with optional sides.