Overnight Slow Cooker Steel Cut Oats with Banana

Bahan-bahan (6 porsi)

• 1.5 cups steel cut oats
• 4 cups water
• 2 cups milk (any kind you like (I used skim))
• 2 large mashed ripe bananas (plus additional banana slices for serving)
• 3 tablespoons ground flaxseed meal*
• 2 teaspoons pure vanilla extract
• 1 1/2 teaspoons ground cinnamon
• 1/2 teaspoon freshly grated nutmeg
• 1/2 teaspoon kosher salt
• For serving: chopped toasted walnuts