Preheat the oven to 350 F. Butter or oil an 8x8 glass pan (or use parchment paper).
Base & Topping: In a large bowl add your flour, old fashioned oats, baking soda, salt, white sugar, and brown sugar. Whisk until combined. Add your melted coconut oil (or melted vegan butter) and vanilla extract and mix until you have a soft dough.
1 1/4 cup all-purpose flour, 1/2 tsp baking soda, 1 1/4 cups old fashioned oats, 1/4 tsp salt, 1/4 cup granulated white sugar, 1/2 cup brown sugar (packed), 3/4 cup melted coconut oil or vegan butter, 2 tsp vanilla extract
Filling: In a medium bowl add your sliced strawberries, diced rhubarb, lemon juice, cornstarch, white sugar, and maple syrup. Mix until combined.
1 1/2 cups sliced strawberries, 1 1/2 cups diced rhubarb, 1 tbsp lemon juice, 1 tbsp cornstarch, 1 tbsp granulated white sugar, 1 tbsp maple syrup
Pour 2/3 of the flour/oat mixture into your pan and press down firmly and evenly with the back of a spoon.
Pour your fruit filling on top evenly. Crumble the rest of the flour/oat mixture over the fruit.
Bake for 45-55 minutes or until the top has become slightly browned and crisp.
Let cool for at least 20 minutes before cutting into bars. (The longer you let them cool, the more clean cut your bars will be)Serve with vanilla ice cream for the best treat!