In a bowl, dissolve yeast in warm water. Add oil, sugar, salt and 2 cups flour; beat until smooth. Stir in enough remaining flour to form a soft dough. Turn onto a floured surface; knead until smooth and elastic, about 6-8 minutes. Place in a greased bowl, turning once to grease top. Cover and let rise in a warm place until doubled, about 1 hour. Punch dough down. Turn onto a floured surface; divide in half. Roll each portion into a 12x8-in. rectangle; set aside.
For sauce, combine the onion and garlic in a microwave-safe dish. Cover and microwave on high for 1 minute. Add tomato sauce and basil; cover and cook at 50% power for 3 minutes or until bubbly. Spoon over crust to within 1/2-in. of edges. Sprinkle with 3 cups mozzarella cheese, pepperoni and olives.
Roll up jelly-roll style, starting with a long side; pinch seam to seal. Cut each roll into 12 slices. Place cut side down on a greased baking sheet. Sprinkle with remaining cheese. Bake at 400° for 15 minutes or until crust is golden and cheese is melted. Serve warm.
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