1Spray 2 (12-inch) pizza pans with cooking spray (without flour). In small bowl, stir warm water, gelatin, yeast, oil, honey and vinegar until yeast is dissolved; set aside.
2In medium bowl, mix flours, xanthan gum, guar gum and salt. Add yeast mixture; beat with electric mixer on low speed 1 minute.
3Divide dough in half. Spread half of dough in each pizza pan. Lightly spray dough with cooking spray (without flour); cover with plastic wrap. Let rise in warm place (80°F to 85°F) until doubled in height, about 45 minutes.
4Heat oven to 425°F. Uncover dough; bake 10 minutes or until surface is dry. Remove from oven. Spread pizza sauce over each crust; sprinkle with bell pepper, mushrooms, basil and cheese. Bake 15 to 20 minutes longer or until crust is browned and cheese is melted.