Pumpkin Apple Streusel Muffins

INGREDIENTS

• 2 1/2 cups all-purpose flour
• 2 cups white sugar
• 1 tablespoon pumpkin pie spice
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 2 eggs, lightly beaten
• 1 cup canned pumpkin puree
• 1/2 cup vegetable oil
• 2 cups peeled, cored and chopped apple
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• 2 tablespoons all-purpose flour
• 1/4 cup white sugar
• 1/2 teaspoon ground cinnamon
• 4 teaspoons butter