In a saucepan combine the rhubarb, sugar, corn starch and vanilla - cook over medium heat, stirring occasionally until thick - set aside
With a pastry cutter or a fork mix oatmeal, flour, brown sugar and butter together into a crumble
Pat 3/4 of the crumble mixture into the bottom of a 9x13 baking dish
Pour in rhubarb mixture
Heat the strawberry jam in the microwave for a few seconds then pour over the rhubarb mixture - running a knife through it to swirl and spreadThe strawberry jam is optional but it does taste delicious in this recipe!
Sprinkle remaining crumb mixture over the top
Bake in a 350° pre-heated oven for 30-35 minutes
Nutrition values are estimates, for exact values consult a nutritionist.