Overnight Slow Cooker Apple Crisp Steel-Cut Oats

Ingredients

• 2 cups (500 ml) steel-cut oats
• 4 cups (1 L) milk
• 2 cups (500 ml) water
• 4 (large) apples (peeled, cored and chopped)
• 1/4 cup (60 ml) butter, chopped into 3-4 pieces
• 1/3 cup (80 ml) brown sugar
• 2 tbsp (30 ml) cinnamon
• 1/4 tsp (1 ml) salt
• 2 tbsp (30 ml) ground flax or chia seeds or hemp hearts (optional)