Vegan Banana Crumb Muffins

Name: Vegan Banana Crumb Muffins
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: American
Ingredients: 2 batches flax eggs; 4 medium ripe bananas ((don’t worry about measurements – it’s forgiving)); 1/2 heaping cup (packed) brown sugar; 1/4 cup vegan butter ((such as Earth Balance // or use coconut oil // melted)); 1 tsp vanilla extract; 2 tsp baking soda; 1/2 tsp sea salt; 1.5 cups whole-wheat pastry flour ((or unbleached all-purpose)); 1/2 cup rolled oats; 1/4 cup walnuts ((optional // chopped)); 1/4 cup raw sugar; 5 Tbsp unbleached all-purpose flour; 2 Tbsp vegan butter ((such as Earth Balance))