Preheat oven to 350. Grease 9x9 or 9x7 baking dish or line with parchment paper.
In a food processor, add sunflower seeds and oats and pulse until finely ground.
In separate bowl, mix wet ingredients (you may need to microwave or heat in saucepan for a few seconds to soften oil and sunflower seed butter), except egg, and set aside.
Take 1 cup of oat/sunflower mixture and 1/4 cup of wet ingredients and mix into a separate container. This is for the crumb topping.
Beat the egg into the remaining wet mixture and pour into the food processor with remaining oat/sunflower mixture. Pulse until completely combined.
Press the mixture into your parchment paper lined or greased baking dish until evenly distributed. Bake for 15-18 minutes.