Melt butter in a medium saucepan over medium high heat. Add the flour and cook stirring for 1 minute.
Whisk the milk in slowly, then stir in the chili powder, bring to a simmer and cook for 5 minutes until thick.
Stir in the cheeses until completely melted. Then stir in the pasta, chorizo, and pickled jalapenos.
Spread into an even layer in an 8”x10” baking dish. Top with crushed tortilla chips and bake until bubbling around the edges, about 20 minutes, until bubbling around the edges.
Remove from oven and let sit for 5 minutes before serving.