Preheat the oven to 325°F.
In an ungreased 1 ½ quart casserole dish, beat the eggs until fluffy. Stir in the leftover oats, coconut milk, almond milk, vanilla, coconut sugar, raisins, Himalayan salt, pumpkin pie spice, and the essential oils, mixing well.
Bake uncovered for 50 to 60 minutes, stirring every 15 minutes until most of the liquid is absorbed. Remove from the oven. The top of the porridge may be wet and not fully set. Be careful not to overbake, or it may curdle.
Stir well and let the porridge stand for at least 15 minutes. The more time it has to settle and cool, the more the liquid will be absorbed. (For ultimate creamy goodness, place it in the refrigerator overnight.) Serve cold or reheat in a 325°F oven for 15 to 30 minutes.