Good-Cooking - Cheesecake Supreme with Blackberry Sauce

Ingredients

• 1 3/4 cups finely crushed cinnamon graham crackers
• 1/4 cup finely chopped walnuts
• 1/2 teaspoon ground cinnamon
• 1/2 cup butter, melted
• 24 ounces cream cheese, softened
• 1 cup granulated sugar
• 2 tablespoons all-purpose flour
• 1 teaspoon vanilla extract
• 1/2 teaspoon fresh lemon juice
• 2 eggs
• 1 egg yolk
• 1/4 cup heavy whipping cream
• 1 pint fresh blackberries or 1 (12 ounce) package frozen blackberries, thawed
• 1/4 cup granulated sugar, or more to taste