Heat oven to 350ºF. Spray 13x9-inch pan sprayed with cooking spray.
Cook spaghetti according to package directions. Drain; rinse with cold water; drain again.
Meanwhile, add Velveeta cubes, cream of chicken soup, milk and Rotel tomatoes to a skillet; cook and stir over med to med-high heat until VELVEETA is completely melted and mixture is well blended. Stir in chicken and half of the bacon crumbles.
Stir cooked pasta into cheese and chicken mixture until mixed well. Spread into prepared casserole dish.
Cover and bake 15-20 minutes or until heated through. Sprinkle with the remaining bacon crumbles and (optional) diced jalapenos.
Notes
How spicy is chicken spaghetti with Rotel? Can I adjust the heat level?Rotel comes in mild, medium, and hot versions, so choose the level of heat that's best for you. You can also add more diced green chiles and/or jalapenos to up the spicinessIs there a substitute for Rotel tomatoes if I can't find them?If you can't find Rotel tomatoes (or the store brand equivalent), you can substitute them with a can of diced tomatoes and add a small amount of diced green chilies or jalapenos to achieve a similar level of spiciness and flavor.Can I use any other type of pasta for this Rotel chicken spaghetti bake?While spaghetti is the traditional choice, you can experiment with pasta alternatives like linguine, fettuccine, or even penne.Make-Ahead DirectionsPrepare the recipe as directed and place in the prepared casserole dish. Cover and refrigerate for up to 2 days. Preheat oven to 350°; cover and bake the casserole for 30-35 minutes or until heated through.StorageStore in an airtight container and refrigerate for up to 2 days or freeze for up to 2 months. Cover and reheat in the microwave. Note that the sauce texture will be thicker and not as creamy upon reheating.