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In a large skillet, heat oil over medium heat. Saute onion until translucent, about 3 minutes. Add garlic and saute 1 minute more. Remove pan from heat and mix in chicken, tomatoes, cilantro and sour cream. Set aside.
To make the cheese sauce: In a medium saucepan, melt butter over medium-high heat. Add flour and cook 2 minutes. Whisk in heavy cream and bring to a simmer. Add cheese and nutmeg and stir until melted. Season sauce with salt, to taste.
To assemble: Reduce oven temperature to 350 degrees F. Stuff manicotti tubes with chicken mixture and assemble in a 9 by 12-inch baking dish. Pour cheese sauce over the top. Bake 30 minutes until cheese is bubbling. Drizzle tomatillo sauce on Maniladas before serving.