Preheat oven to 375 F (190 C) Mix flax, almond meal, nutritional yeast, maple syrup, milk, vanilla and cinnamon in a bowl. Use a fork or whisk and mix well. Place in refrigerator so ingredients can set. You can also do this the night before. Put all crumble topping ingredients, except coconut butter, into a food processor and pulse until chopped. Add coconut butter and pulse to combine. Slice bread slices into 4 squares each, you should have a total of 36 small squares. Put 1 teaspoon of liquid mixture in the bottom of each muffin space. Add 1 square piece of bread. Place about 5-6 blueberries, depending on size, so that they cover the center of the bread. Sprinkle about 1/2 tablespoon of crumble topping over the blueberries. Put 1 square piece of bread over the top and use your fingers to pack it in well. Place 5-6 more blueberries on the bread. Sprinkle about 1/2 tablespoon of crumble topping over the blueberries. Put another square piece of bread over the top and use your fingers to pack it in well. Sprinkle with a little bit of the crumble topping (about a teaspoon). Carefully add 1 tablespoon of liquid mixture over the top, making sure to evenly coat so that all the bread gets soaked. Add 2-3 more blueberries on top for décor, and sprinkle with a tad of plain coconut sugar if you want. Bake for 35 minutes. Because ovens vary, start checking them at 25 minutes. They are ready when the tops begin to brown.