Pumpkin Sheet Cake With Cream Cheese Frosting

Name: Pumpkin Sheet Cake With Cream Cheese Frosting
Prep time: 20 min
Total time: 20 min
Cuisine: American
Ingredients: 2 sticks salted butter; 2 c. pumpkin puree (not pumpkin pie filling!); 2 tsp. pumpkin pie spice; 1/2 c. boiling water; 2 c. all-purpose flour; 2 c. granulated sugar; 1/4 tsp. salt; 1/2 c. buttermilk; 2 eggs; 2 tsp. baking soda; 2 tsp. vanilla extract; 1/2 tsp. maple extract (optional); 8 oz. cream cheese, softened; 1 stick unsalted butter, softened; 1 lb. powdered sugar; Dash of salt; 1 tbsp. half and half or whole milk, plus more if needed for thinning