Prepare the Berry Compote: In a small saucepan, combine the frozen mixed berries, honey or maple syrup, and vanilla extract over medium-low heat. Cook for 5-10 minutes until thickened.

Cook the Oats: In a medium saucepan, bring the old-fashioned oats, water, and a pinch of salt to a boil. Reduce heat to low and simmer for 5-8 minutes until tender.

Combine with Eggs: In a separate bowl, whisk the eggs and cold milk together, then gradually add to the cooked oats on low heat for 1-1.5 minutes.

Serve: Spoon the custard oats into bowls and top with the berry compote. Add nuts, seeds, or yogurt if desired.