In a medium bowl, mix together flour, brown sugar, and cinnamon until well combined. Drizzle in melted butter and mix until clumpy. Set aside.

Lay out egg roll wraps; place about 2 tablespoons of apple pie filling in the center of each wrap. Top with a sprinkle of prepared streusel.

Brush edges of each egg roll wrap with melted butter and fold to seal tightly. Ensure each egg roll is well sealed.

Heat vegetable oil in a large skillet over medium heat until it reaches 350°F. Use a thermometer for accuracy.

Carefully place sealed egg rolls into the hot oil, frying for 2-3 minutes on each side or until golden brown.

Transfer fried egg rolls onto a paper towel-lined plate to absorb excess oil. Sprinkle with chopped walnuts and drizzle caramel on top.