Gather materials: 4 Iron Ingots and 1 Pumpkin
Open the crafting table (or place a crafting grid)
Place the Pumpkin in the top-center slot
Place Iron Ingots in the remaining three-by-three slots to form an iron golem shape:
Fill the middle row with 3 Iron Ingots (left, center, right)
Fill the left and right slots of the bottom row with 2 Iron Ingots
Fill the left and right slots of the top row with 2 Iron Ingots
Leave the center slot of the bottom row empty
Confirm the crafted Iron Golem result and collect it
Alternative (mob-spawn) method: place 4 Iron blocks in a “T” shape and place a Pumpkin on top to spawn the Iron Golem