In a small skillet, saute red pepper and onion in oil until tender. Transfer to a large bowl; stir in 1/2 cup spinach (save the rest for another use). Stir in the cheese, corn, beans, jalapeno, cumin, chili powder and salt.
Place 1 sheet of phyllo dough on a work surface with a short end facing you. (Keep remaining phyllo covered with a damp towel to prevent it from drying out.) Spray sheet with butter-flavored spray; cut into three 14x3-in. strips.
Place a scant tablespoon of filling on lower corner of each strip. Fold dough over filling, forming a triangle. Fold triangle up, then over, forming another triangle. Continue folding, like a flag, until you come to the end of the strip.
Spritz end of dough with spray and press onto triangle to seal. Turn triangle and spritz top with spray. Repeat with remaining phyllo and filling.
Place triangles on baking sheets coated with cooking spray. Bake at 375° until golden brown, 10-12 minutes. Meanwhile, mash avocado with the mayonnaise, sour cream and vinegar. Serve with warm appetizers.
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