Optional: Add chopped rhubarb and strawberries to a small pan and pour maple syrup over top. Bring to a boil over medium heat and simmer until rhubarb has broken down. This will help bring out the sweetness of the rhubarb and deepen its flavor. Set aside to cool.
Pre-heat oven to 350 degrees. Arrange 7 jumbo (5 oz) silicone muffin cups on a baking sheet and spray with non-stick cooking spray like coconut oil.
Mix all dry ingredients, then add wet ingredients and mix until just combined. Using a 4 oz ice cream scoop, divide batter evenly into 7 muffin cups.
Bake at 350 degrees for 35 minutes.
Notes
If you would prefer to use whey protein instead of plant protein, just cut the amount of almond milk to 1/2 cup.