Ingredients

• 1 apple, cut into 1/2" pieces
• 1 (2") piece fresh ginger, finely chopped
• 2 cups steel-cut oats
• 1 cup short-grain brown rice, millet, or quinoa
• 1/2 cup golden raisins (optional)
• 1/2 cup rolled old-fashioned oats
• 1/2 cup slivered almonds (optional)
• 2 tablespoons flaxseeds (optional)
• 1 teaspoon ground cinnamon
• 1 teaspoon kosher salt

Instructions

1. Mix apple, ginger, steel-cut oats, rice, old-fashioned oats, raisins (if using), almonds (if using), flaxseeds (if using), cinnamon, and salt in a slow cooker. Cover with 12 cups water and stir to combine. Cook on low until porridge is thick and soft, 7–8 hours.
2. Do Ahead Porridge can be made 1 week ahead; transfer to an airtight container and chill. To serve, scoop out desired amount and add a splash of water or milk. Heat in a pot over medium or microwave on high in a heatproof bowl until heated through and desired texture is reached, adding more liquid if needed.
3. Porridge can be made 1 week ahead; transfer to an airtight container and chill. To serve, scoop out desired amount and add a splash of water or milk. Heat in a pot over medium or microwave on high in a heatproof bowl until heated through and desired texture is reached, adding more liquid if needed.