Ingredients:

• Streusel: 1 cup all-purpose flour, ¾ cup packed brown sugar, 1 tbsp ground cinnamon, ¼ tsp salt, ½ cup (1 stick) cold unsalted butter, cubed.
• Cake: 2 cups all-purpose flour, 1 cup granulated sugar, 2 tsp baking powder, ½ tsp salt, ½ cup unsalted butter (softened), 2 large eggs, ¾ cup whole milk, 2 tsp vanilla extract.

Instructions:

1. Preheat oven to 350°F (175°C). Grease an 8×8-inch square pan.
2. Make the streusel: Whisk flour, brown sugar, cinnamon, and salt. Cut in cold butter using a pastry cutter or fingers until coarse crumbs form. Chill while making the batter.
3. Make the batter: Cream softened butter and granulated sugar until fluffy (2–3 minutes). Beat in eggs one at a time, then add vanilla.
4. Whisk dry ingredients separately, then alternate adding them to the wet mixture with the milk, starting and ending with flour. Mix just until combined.
5. Spread batter into the pan, sprinkle the streusel evenly over the top, and press down gently.
6. Bake for 35–40 minutes until a toothpick inserted in the center comes out clean.