In a large skillet, melt butter over medium heat. Add onions, bell pepper, and cook until softened, 5 minutes.
Season crawfish with 1 TBLS Dirty Gringo, add crawfish and green onions, (save some for garnishing later) stirring to combine.
Cook until crawfish is heated through, about 5 minutes.
Add cream cheese, Remove from heat, and stir until cheese is incorporated.
Pour over baked russet potatoes and season with Dirty Gringo to your taste. Garnish with chopped Serrano pepper and green onion tops.