Ingredients

• 2 cups sour cream
• 2 cups vanilla yogurt
• Zest of 1 lemon
• 3/4 cup all-purpose flour
• 1/2 cup packed dark brown sugar
• 5 tablespoons unsalted butter, cut into small pieces
• 2 tablespoons ground cinnamon
• 2 cups chopped walnuts
• 1/2 cup chocolate chips or chunks

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Instructions

1. For the dip: Stir together the sour cream, yogurt and lemon zest in a bowl. Set aside in the fridge.
2. For the streusel topping: Add the flour, brown sugar, butter, cinnamon and 1 cup of the walnuts to a microwave-safe bowl and stir until combined. Microwave, stopping every minute to stir, until the mixture darkens and starts to come together, about 4 minutes. Cool the streusel flat on a plate until slightly hardened, 5 to 8 minutes.
3. Add half of the dip to a large bowl, then sprinkle on the chocolate chips followed by a layer of the streusel. Add the remaining dip and smooth the top. Add the remaining streusel and 1 cup walnuts.