Step 1

Heat a large skillet over medium-high heat. Cook and stir beef in the hot skillet until browned and crumbly, 5 to 7 minutes; drain and discard grease. Mix taco seasoning into ground beef.

Step 2

Combine water, Mexican rice mix, and butter in a saucepan; bring to a boil for 1 minute. Cover saucepan, reduce heat to low, and cook until water is absorbed, about 25 minutes. Mix ground beef into rice mixture.

Step 3

Bring a pot of water to a boil; cook green bell peppers until slightly softened, about 5 minutes. Drain. Fill each bell pepper with beef-rice mixture. Arrange bell peppers in a baking dish. Pour ranch dressing over bell peppers and top each with Mexican cheese blend.

Step 4

Bake in the preheated oven until peppers are tender and cheese is melted, 45 to 50 minutes.