Preheat the oven to 375°F. Get a large rimmed baking sheet ready; line it with parchment paper if desired.
Put the shredded rotisserie chicken in a large mixing bowl. Add about half the tub of spinach and artichoke dip and stir to coat the chicken.
Add the mostly drained, roughly chopped sun-dried tomatoes and about half the jar of Alfredo sauce. Stir everything together.
Season with red pepper flakes, Italian seasoning, onion powder, and garlic powder to taste. Add the shredded mozzarella and mix until the filling is evenly combined and thick.
Divide the filling among the 12 street taco tortillas. Fold each tortilla over the filling and arrange the tacos on the baking sheet.
Lightly spray the tops of the tacos with nonstick cooking spray. Bake for 15 minutes.
Carefully flip each taco, lightly spray the newly exposed sides, and return the pan to the oven for another 5 minutes, until the tortillas are golden and crisp and the filling is heated through.
While the tacos finish, pour the remaining Alfredo sauce into a small saucepan. Warm it on the stovetop, stirring occasionally. Leave it plain, without extra seasonings.
Serve the tacos warm with the Alfredo sauce on the side for dipping.