Heat a wok or large skillet over medium-high heat and add 2 tablespoons oil.
Add the cleaned shrimp and 3 to 4 cups mixed vegetables to the hot wok.
Pour in 2/3 cup Szechuan sauce and stir-fry for 4 to 6 minutes, until the shrimp are opaque and vegetables are tender-crisp.
Remove the shrimp and vegetables from the wok and set aside on plates.
Wipe the wok lightly if desired, then drizzle in 1 to 2 tablespoons oil for the fried rice; leftover sauce in the pan can add flavor.
Add 1 to 2 cups cooked rice and 1/2 cup diced vegetables (if using) to the wok and break up any clumps.
Crack in 1 egg and stir quickly, mixing the egg into the rice until cooked and the rice starts to brown slightly, about 3 to 5 minutes.
Return the shrimp and stir-fried vegetables to the wok with the fried rice, toss to combine, then serve immediately.