In a large skillet over medium-high heat, cook the ground beef until it's nicely browned. This step builds the rich flavor at the foundation of your casserole.

Add the diced onion and sliced mushrooms to the skillet, sautéing until they soften. This will enhance the flavors and bring out the natural sweetness of the onion.

Stir in the minced garlic and cook everything for another minute until it's fragrant. The aroma will be mouthwatering, making everyone curious about dinner!

Add the green beans and broth to the skillet, covering it to steam the beans until they're just tender. This method preserves their crispness while ensuring they soak up the flavors.

Reduce the heat to low and stir in the sour cream, cream cheese, thyme, Worcestershire sauce, salt, and pepper until the sauce is creamy. It's essential to get this perfect for the ultimate comfort factor!

Sprinkle the mixture with shredded Colby jack cheese, covering the top. This will become your gooey, melty layer that makes the dish irresistible.

Cover and cook for a few minutes until the cheese is completely melted and bubbling. It's the best part, making everything feel cozy and delicious.

Spoon out the casserole and serve it warm straight from the skillet. It's perfect for a family dinner or even meal prep for the week ahead.