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In 12-inch nonstick skillet, add hot water and sauce mix (from Hamburger Helper™ box); stir to combine. Stir in milk, uncooked pasta (from Hamburger Helper™ box) and pepper flakes. Heat to boiling, stirring occasionally. Reduce heat; cover and simmer 6 minutes, stirring occasionally. Stir in turkey and spinach; cover and simmer 5 to 6 minutes or until pasta is tender. Remove from heat.