Bring a skillet over medium high heat and add in oil. Add onion, carrots, asparagus and garlic and cook for 5-7 minutes or until cooked through and lightly browned.
Pour veggies into a greased 8x8 pyrex dish and let cool slightly. In another bowl combine eggs, almond milk, sage and salt and whisk to combine.
Pour eggs over the veggies and bake for 35-45 minutes, or until the casserole is set in the middle. Cut into slices and enjoy!