Ultimate Cinnamon Streusel Coffee Cake

4.97 from 115 votes

Ultimate Cinnamon Streusel Coffee Cake

My cinnamon streusel coffee cake has a super moist base, a brown sugar swirl, and an irresistible cinnamon crumb topping. I love the crumb topping, so I made sure you'll get some in every single bite.

Course Breakfast

Cuisine American

Prep Time 10

Cook Time 45

Total Time 55

Servings Slices

Calories 361kcal

Author Krystle Smith

Ingredients

For the Topping

½ Cup Dark Brown Sugar Packed, Or Light Brown Sugar
1 Tablespoon Cinnamon Ceylon Cinnamon Is Best
½ Cup Flour Measured Properly (see below)
4 Tablespoons Butter Softened

For the Filling

¼ Cup Brown Sugar Packed

For the Coffee Cake

¾ Cup Butter Softened
1 Cup White Sugar
1 Egg PLUS One Egg Yolk Room Temp.
1 Cup Whole Milk Warmed
2 Teaspoons Vanilla
1 Teaspoon Baking Powder
½ Teaspoon Baking Soda
½ Teaspoon Salt
2 Cups Flour

Instructions

For the Streusel and Topping

In a large bowl combine brown sugar, cinnamon, and flour. Cut in butter with 2 forks until mixture resembles coarse crumbs.

For the Cake

Preheat oven to 350 degrees. Spray an 8x8 or 9x9 inch square metal baking pan with cooking spray.
In a large bowl cream butter and sugar until light and fluffy. Stir in egg, milk, and vanilla.
Stir in baking soda, baking powder, salt, and flour until just combined scraping down the sides as needed.
Pour half of batter into prepared pan. I suggest using half by weight using a food scale. Sprinkle with ¼ cup of brown sugar. Top with remaining batter and spread smooth with a spatula.
Evenly top with streusel. Bake for 40-50 minute or until a tooth pick inserted near the center comes out with just a few moist crumbs. Enjoy!

Notes

Tips For Success:

Don't overmix. Mix until the flour just disappears.
Use room temperature ingredients. I like to warm my milk in the microwave for around 30 seconds and leave my eggs on the counter for 30-60 minutes. You can also dunk your eggs in a glass of warm water for a minute or two.
Start checking for doneness at around 40 minutes. It can be hard to get a reliable toothpick test with the sugary swirl. You can also use a food thermometer, aim for 200 degrees.
Divide your batter by weight using a food scale so you don't have to guess!
Use a light colored metal baking pan. They conduct heat more evenly. Glass tends to heat up slowly, but stay hot longer when removed from the oven. If you only have a glass pan, I suggest lowering the oven temp by 15 degrees and cooking for 10-15 more minutes. If you only have a dark metal pan (i.e. nonstick) reduce oven temp by 20 degree and start checking for doneness 5 minutes early.

Nutrition