Gluten Free Pumpkin Cinnamon Crumb Cake

From the blogger: "This Gluten Free Pumpkin Cinnamon Crumb Cake requires just a few ingredients and is ready in no time. Fluffy pumpkin cake is swirled with a sweet cinnamon streusel and then baked until golden. This easy cake is perfect to serve at all of your holiday gatherings! So if you’re entertaining for the holiday season and need an impressively easy dessert to make, this Gluten Free Pumpkin Cinnamon Crumb Cake is it. It’s warm, cozy and just the treat for the holidays!"