Add the onion and sauté until softened, 10-15 minutes.
Meanwhile, slather the hot dog buns with the cream cheese and toast (in the oven or on a grill).
Cook the dogs as desired. I toss mine on the grill or into the air fryer until the skin is just a bit crispy. You do you!
Place hot dogs on buns. Top with sauteed onions and yellow mustard.
Heap on the sweet onion sauce and serve.
For the sweet onion sauce
Heat the oil in a large skillet over medium heat.
Add the onion and peppers. Saute until just soft.
Add the remaining ingredients and stir.
Reduce heat and keep warm until ready to use.
Notes
Use any kind of mustard you like.For a little more kick (and you do get a bit from the cayenne), add a seeded and chopped jalapeno to the onion and peppers as they saute.