Apple-Nut Cinnamon Streusel Cake

Apple-nut cinnamon streusel cake is a soft, sour-cream-rich coffee cake studded with chopped fresh apples and toasted sunflower seeds, then crowned with a buttery cinnamon-brown sugar streusel that crisps and caramelizes in the oven. The two cups of sour cream in the batter is what makes the difference, contributing tang and a tender crumb that stays moist for days.

Sunflower seeds in place of the more typical pecans or walnuts are an unusual but practical swap. They’re cheaper, allergy-friendlier (this works for tree nut allergies), and add a slightly different sunflower-seed crunch with a milder, more buttery flavor than tree nuts. Toasted before mixing in for the deepest flavor.

Baked in a 9×13 sheet pan rather than a tube or bundt, the cake cuts into generous squares that work for breakfast, brunch, or afternoon coffee. Serve warm or at room temperature, and dust the cooled cake with powdered sugar for a clean bakery-style finish.

Pro Tips

• Use firm, slightly tart apples like Granny Smith, Honeycrisp, or Braeburn for the best texture and flavor balance. Soft apples like Red Delicious turn mushy in the bake.
• Toast the sunflower seeds in a dry pan for 3 to 5 minutes before adding to either the cake or the topping. The flavor is dramatically nuttier and more pronounced.
• Spread the streusel evenly over the entire surface so every square gets a generous topping. Patches of bare cake feel cheated.
• Cool the cake at least 20 minutes before cutting. Warm cake crumbles more easily; cool slices clean.

Variations

• Substitute pecans, walnuts, or chopped almonds for the sunflower seeds if you don’t have nut allergies in the household.
• Add ½ cup of dried cranberries or raisins along with the apples for additional fruit pockets.
• Use pumpkin pie spice in place of plain cinnamon for a more complex autumnal flavor.