Rice Cooker Super Cheesy Polenta

2 tablespoons butter

½ onion, chopped

1 clove garlic, minced

1 cup chicken broth

1 cup milk

½ cup polenta

¼ teaspoon salt, or more to taste

2 ounces shredded Cheddar cheese

2 ounces shredded Parmesan cheese

¼ teaspoon freshly ground black pepper

Place butter, onion, and garlic in rice cooker; close lid and turn on cooker. Cook until onion is soft and translucent, stirring occasionally, 10 to 15 minutes. Add chicken broth, milk, polenta, and salt. Cover and cook on full cycle, stirring occasionally, until polenta has absorbed the liquid, about 20 minutes. Add Cheddar cheese, Parmesan cheese, and black pepper; stir until cheese is melted.