Preheat oven to 350° Fahrenheit. Place medium saucepan on stovetop over medium heat.
Add 8 ounces full-fat cream cheese and ¾ cup buffalo sauce to saucepan. Stir ingredients together, breaking up cream cheese cubes, until cream cheese has melted and ingredients are incorporated.
Once cream cheese and buffalo sauce are combined, add ¾ cup blue cheese dressing, ½ cup full-fat sour cream, and 3 cups cooked, shredded chicken to saucepan. Stir until all ingredients are well incorporated.
Add ¾ cup shredded fresh mozzarella to saucepan in small increments, stirring well to incorporate. Repeat until entire ¾ cup has been added.
Transfer chicken mixture to 8x8 baking dish. Spread mixture out across baking dish in one even layer, covering bottom of dish completely.
Sprinkle ¼ cup shredded fresh mozzarella evenly over top of chicken mixture, then place baking dish in preheated oven. Bake chicken dip 15 minutes or until mozzarella is melted and bubbly, but not browned or burnt.
Carefully remove baking dish from oven. Top with drizzle of ranch dressing and sprinkle of diced green onions if desired. Serve hot with celery sticks, lettuce cups, bell pepper strips, keto tortilla chips, or other dip vessels of choice.
Recipe Notes
Chicken: Prepackaged shredded chicken or rotisserie chicken work well here, or you can cook and shred chicken specifically for this recipe. Check out this recipe for The Best Shredded Chicken plus 5 super easy shredding methods.
Mozzarella: Shred your own mozzarella from a block, instead of using prepackaged, preshredded mozz. Those contain additives to keep the cheese from clumping in the package, which add unnecessary carbs and keep the cheese from melting like it should.
Heat: For a hotter chicken dip, mix in diced jalapeños, or add sliced jalapeños and/or more hot sauce on top of the dip after baking.