Step 1: Prepare Your Ingredients

• Preheat your oven to 350°F (175°C).
• Grease and flour a 9-inch baking pan (or line it with parchment paper).
• Gather all your ingredients so you can work smoothly.

Step 2: Make the Cake Batter

1. Cream the butter and sugar – In a large bowl, beat the softened butter and sugar together until light and fluffy. This helps create a tender cake texture.
2. Add the eggs & vanilla – Mix in one egg at a time, then add the vanilla extract.
3. Combine dry ingredients – In a separate bowl, whisk together the flour, baking powder, and salt.
4. Alternate adding dry ingredients & buttermilk – Slowly add the flour mixture, alternating with buttermilk, until just combined. Do not overmix – this keeps the cake soft and fluffy!
5. Gently fold in the raspberries – Use a spatula to carefully mix in the raspberries.

Step 3: Make the Streusel Topping

1. In a small bowl, mix brown sugar, flour, cinnamon, and cold butter.
2. Use a fork or your fingers to crumble the butter into the mixture until it resembles coarse crumbs.

Step 4: Assemble & Bake

1. Pour the batter into the prepared pan, spreading it evenly.
2. Sprinkle the streusel topping generously over the batter.
3. Bake for 35–40 minutes, or until a toothpick inserted in the center comes out clean.
4. Let the cake cool in the pan for 10 minutes, then transfer to a wire rack.

Step 5: Optional Glaze

• Whisk together powdered sugar and milk (or lemon juice).
• Drizzle over the cooled cake for an extra touch of sweetness!