Make the sauce: in a large skillet, melt the butter and add the flour. Cook the flour for about 2 minutes and whisk in the milk, sour cream, chicken broth, spices, jalapeno, salt and pepper to taste. Cook for about 3 minutes or until thickened. Preheat the oven to 350 F.
Make the enchiladas: in a large bowl combine the shredded chicken, corn, bell pepper, jalapenos, green onions, and 1 1/2 cups of shredded pepper jack cheese.
Wrap the flour tortillas in a damp cloth and microwave for 30 seconds.
Divide the filling equally between the 8 tortillas. Place the filling in the middle of the tortilla horizontally, cover with one half of the tortilla, and roll cigar-style.
Place the rolled tortillas into a 7x11-inch baking dish and pour the sauce over them.
Sprinkle with the remaining 1 1/2 cups shredded pepper jack cheese and bake for 20 minutes or until the cheese is melted and bubbly.