Super Easy Pumpkin Crumb Cake

I'm so excited to share this recipe. I always know when I find or create a good recipe when it disappears quick, and boy does this go quick at my house. This recipe comes from a combination of a couple pinterest finds, plus a few revisions of my own. LOVE. (Original recipe sources: Pretty.Good.Food  and Mommy I'm Hungry)

Super Easy Pumpkin Crumb Cake

INGREDIENTS:
Cake:
1/3 c. water
1/2 can pumpkin
2 eggs
1 TBSP vanilla
2 tsp. pumpkin pie spice (I always just make my own: 1 tsp. cinnamon, 1/2 tsp. ginger, 1/2 tsp. nutmeg, & 1/4 tsp. ground cloves)
1 box yellow cake mix
1 tsp. baking soda

Crumb Topping:
3/4 c. rolled oats
1/2 c. flour
1/2 c. brown sugar
1/2 tsp. cinnamon
6 TBSP butter
(I am always generous with the rolled oats and the brown sugar - because to me, that's what makes a better crumb topping)

DIRECTIONS:
Preheat oven to 350 degrees. Grease a 9x13 pan.
Mix water, pumpkin, eggs, vanilla, and pumpkin pie spice together. Once combined, add the cake mix and baking soda. Mix until just combined. Pour into prepared pan. Set aside.
Make the crumb topping by mixing all the ingredients until crumbly. Sprinkle on top of the cake batter already in the 9x13 pan.
Bake for 40-45 minutes or until a toothpick comes out clean.
Serve warm or let cool. Either way is delicious!