Heat oven to 425°F. Oil a large sheet pan and dust with cornmeal.
Stretch dough to fit the pan. Dock with a fork and par-bake 7 minutes until just set.
Brown ground beef in a skillet over medium-high heat, 5–6 minutes. Drain any excess fat.
Stir in taco seasoning and water. Simmer 2–3 minutes until thick and saucy.
Warm refried beans so they spread easily. Remove crust from oven.
Spread beans over crust. Spoon salsa on top, then scatter seasoned beef and cheese.
Bake 10–12 minutes until cheese melts and crust is golden at the edges.
Rest 5 minutes. Top with lettuce, tomatoes, olives, green onions, and jalapeños.
Drizzle with sour cream, slice, and serve warm.