elsie's rhubarb crunch

Ingredients For elsie's rhubarb crunch

• 1 c

  flour, all purpose
• 3/4 c

  oatmeal, uncooked
• 1 c

  brown sugar
• 1/4 c

  butter, melted
• 1 tsp

  cinnamon
• 1 c

  sugar, white
• 2 Tbsp

  cornstarch
• 1 c

  water
• 1 tsp

  vanilla
• 2.5 - 3 c

  chopped rhubarb (i use small pieces)