First cook the chicken. I like to poach it in water: just add the chicken breasts to lightly boiling water, and simmer until the chicken is cooked through - about 10-15 minutes.
Once the chicken is cooked, cut it up in to bite sized pieces, then shred it.
In a separate bowl, combine the cream cheese, hot sauce, ranch dressing and cheese. Mix until combined and creamy.
Add the cooked chicken to the hot sauce mixture and combine.
Transfer the mix to an oven proof dish.
Bake for 35-45 minutes, until hot and bubbly. Stir it occasionally.
Notes
If you are rushed for time, you can cook this dish in the microwave on high for about 15 minutes, until hot and bubbly. Stir it often.