Cook Oats: In a medium saucepan, heat 1 tsp oil over medium heat. When the oil is hot, add shallots. Cook for 2 min, stirring often, until just tender. Add oats and garlic. Stir to coat.
Add 2 ½ cups water (or vegetable stock). Stir to combine. Bring to a simmer. Once simmering, reduce heat to low. Cook for 8-10 min, stirring often, until creamy and tender. Off heat, stir in miso and tamari.
Cook Kale: Meanwhile, in a large skillet, heat 1 tsp oil over medium heat. When the pan is hot, add kale. Season with salt. Cook for 2-3 min, stirring often, until tender. Stir in garlic and sprinkle with chili flakes to taste. Transfer to a bowl and set aside.
Cook Mushrooms: To the same pan, add another 1 tsp oil and mushrooms. Season with salt and black pepper. Cook mushrooms for 4-6 min, stirring occasionally, until golden and tender.
Serve: Divide oats between bowls. Top with kale, mushrooms and avocado. Sprinkle scallions over top. Sprinkle with sesame seeds and finish with a drizzle of sesame oil. Drizzle with hot sauce (like sriracha) or chili oil, if desired.