His first came courtesy of a brilliant through-ball from Ron Wilson, which he calmly slotted.
Hay was on the score sheet again almost immediately as Connor Tulloch came up with a well-timed cross into the Bream Bay box.
The game descended into a battle of missed opportunities in the middle stages of the opening stanza. Neither side could capitalise on their attacking raids.
But a free kick gave Madhatters a chance to double their lead. Adrian Booth set up and hit a phenomenal well-weighted shot that flew just out of reach of the Bream Bay goalkeeper.
Hay then completed a first half hat-trick with a stunner, hitting a nutmeg on a would-be defender before curling it into the goals. This gave Madhatters a 4-1 halftime lead.
The second half wasn't nearly as expansive as neither side were able to sustain pressure.
Madhatters added two goals in the spell. Booth made it a brace after calmly kicking a penalty before Greg Tetlaw was rewarded for an industrious effort.
Bream Bay added a goal before full time through Gillingham but the contest was over long before the strike.
In the other men's match, Kerikeri showed why they are the top side in the competition with a 2-0 victory over Central Brown.
Meanwhile Kamo had a big ask as they looked to take out the NFF Women's Federation One Cup over Hibiscus Coast.
Hibiscus Coast proved to be a big mountain to climb for Kamo, who were put on the backfoot early.
Natalie Cyra put on an impressive display in the first half for Hibiscus Coast, scoring a hat-trick.
Nikki Jones hit a second half free kick to put the icing on the cake for Hibiscus Coast, taking out the Cup with a 4-0 victory.
In the Northland Women's Premier division, there was plenty of action for the crowds to take in.
Madhatters/Hora Hora showed great form to defeat Tikipunga Diamonds 3-1.
Meanwhile Kerikeri High School were one of two sides with clean sheets as they kept out Onerahi in their 3-0 win.
Kaitaia United were the other side with a sublime defensive performance as they scored the only goal in their clash with Central Brown.