Combine chicken, cream cheese, and salsa in a small saucepan. Heat over medium heat until warmed through, 5 to 10 minutes. Stir in heavy cream and fajita seasoning until combined. Stir in 1 cup shredded Cheddar cheese.
Transfer mixture to a 1-quart baking dish. Top with 2 tablespoons shredded Cheddar cheese.
Bake in preheated oven until cheese is melted and dip is hot, 10 to 15 minutes. Serve with Snack Factory(R) Original Pretzel Crisps(R).