Rice Cooker Super Cheesy Polenta

Ingredients (10)

• + 2 tablespoons butter add to pantry
• + ½ onion, chopped add to pantry
• ✓ 1 clove garlic, minced
• + 1 cup chicken broth add to pantry
• + 1 cup milk add to pantry
• + ½ cup polenta add to pantry
• ✓ ¼ teaspoon salt, or more to taste
• + 2 ounces shredded Cheddar cheese add to pantry
• ✓ 2 ounces shredded Parmesan cheese
• + ¼ teaspoon freshly ground black pepper add to pantry