You can have Low FODMAP Overnight Oats & Chia while follwoing the diet, even during the Elimination Phase, if you watch your portions.
Low FODMAP Serving Size Info: Makes 3 cups (690 g); 6 servings; 1/2 cup (115 g) serving
Scoop out your serving. Heat briefly in microwave, or eat cold; add appropriate low FODMAP toppings and enjoy. The mixture will keep for several days in the refrigerator. Make a batch and eat all week for a quick breakfast or snack.