Step 1

Prepare macaroni and cheese in large saucepan according to package directions, except omit milk.

Step 2

Meanwhile, cook and stir beef in large skillet over medium-high heat until crumbled and no longer pink; drain. Stir in undrained tomatoes. Reduce heat to low; simmer 5 minutes, stirring occasionally.

Step 3

Add beef mixture to prepared macaroni and cheese; stir to combine.