Preheat oven to 350F and grease and flour a 9" x 13" pan or line with parchment paper. Set aside.
Stir jam in a small bowl until smooth and drop by spoonfuls onto the cake batter. Gently swirl through with a knife.
Bake for 20-25 minutes. Remove from oven, add crumb topping.
Top with crumb mixture, clumping it by squeezing it between your fingers while you work and spreading it into as even a layer as possible.
Return to oven for 20-25 minutes longer. Cool for at least 60 minutes before slicing.
Add the melted butter and the maple syrup to the powdered sugar and mix. Then add the cinnamon. If you find the consistency too thick you can add a very little amount of milk to help it drizzle, or you can microwave for a few seconds. I Drizzle onto the coffee cake. It will firm up as the butter cools. Enjoy!
Jam Filled Coffee Cake https://www.lunagrown.com/jam-filled-coffee-cake/