Preheat oven 375degreesF. Grease a 9" round spring form pan or 9" square baking dish with butter.
Place streusel ingredients in a bowl. Mash with a fork into well combine and a little clumpy. Set aside.
Combine all cake ingredients, except the raspberries, in a mixing bowl. Beat for 30 seconds. Can use a mixer or do by hand. Gently fold in raspberries.
Pour cake batter evenly into prepared dish. Top evenly with streusel. Place in oven and bake for 40 to 50 minutes - until a toothpick in the center comes out clean. Allow to cool for 10 minutes before serving. Enjoy!
Recipe by pretty plain janes at https://prettyplainjanes.com/2015/08/26/raspberry-coffee-cake/