Easy Tamale Casserole

Gather all ingredients. Preheat the oven to 400 degrees F (200 degrees C).

Heat a cast iron skillet over medium-high heat. Cook and stir ground beef in the hot skillet until browned and crumbly, 5 to 7 minutes; drain and discard grease. Season beef with salt and black pepper.

Stir onion into ground beef; cook and stir over medium heat for 1 minute, then immediately remove the skillet from heat. Stir in pinto beans and crushed tomatoes.