Prepare thin crust dough as directed. When ready to make pizza, preheat oven to 500°F
Heat skillet over medium heat. Add sausage to pan, toss and break up into small pieces until cooked through and slightly browned. Remove excess fat as needed. Remove from heat, transfer sausage to a size appropriate bowl.
Slice pepper, discarding seeds. A third to half of the pepper should be enough. Cut onion down the center from tip to root. Cut off the bottom, then very thinly slice. Trim down pieces by cutting in half if smaller slices are desired.
Prepare a baking sheet with a light coating of olive oil. Spread out dough carefully. If a hole should happen, simply pinch to fix. Spread pizza sauce over nearly the entire surface, leaving 1/2" edge uncoated. Scatter raw onions, peppers and cooked sausage meat throughout. Sprinkle with cheese. Bake at 500°F for 12 minutes.