Homemade oatmeal recipes made with plant-based milk, such as almond milk, soy milk, or coconut milk, are vegan-friendly. Additionally, alternatives like quinoa flakes, chia seed pudding, buckwheat porridge, and amaranth cereal are all plant-based and suitable for vegans. It's always important to read ingredient labels and ensure that any pre-packaged options are free from animal-derived ingredients.