Ok so 7 Years War starts like OTL and continues for a while. The POD is Elizabeth doesn't die.
On 25 December 1761 Empress Elizabeth fell ill. With that her armies faltered and Frederick's celebrated, but after 2 weeks she climbed out of her bed and yelled, "GET ON WITH IT!" On that not her armies rallied again and surged forth to Berlin. The Austrians seeing this followed suit. After a month of fighting all pockets of resistance were destroyed and the Russo-Austrian force ruled supreme in Germany. Frederick the Great commits suicide. His nephew Frederick Wilhelm II takes power leaving Prussia even worse off than it was.
France finally free of Frederick seized the opportunity to surround the Duke of Brunswick's army. After an intense two months of fighting the French finally achieved a decisive victory.
With victory secured in the north the full might of France marched south to utterly crush Portugal in a series of engagements ending with a Franco-Spanish army taking Lisbon. The Braganzas in an attempt to flee the disaster ran to the sea, but were captured by what was left of the 1759 invasion fleet.
France now holding a harbour far from Britain prepared for their armies to embark and attempt to retake the colonies. While they did so their allies started to renegotiate the division of Europe.
Britain though doing quite while in the colonies with Quebec and Montreal in their hands had doing far worse in Europe. With no allies left on the continent and the possibility of the French retaking their colonies Britain knew that they had to sue for peace. And so Britain did. This resulted in the Treaty of London and the recognition of the Partition of Prussia.
French Demands and Offers
1. Britain would return all colonial gains to their rightful owners
2. Britain would recognize the Partition of Prussia
3. France would return all of Hanover to Britain
4. Russia would return the last subsidy payment from Britain to Prussia that it had captured
5. Britain would recognize the incorporation of Portugal into Spain
Treaty of London(1762)
1. Britain would return Canada, Cuba and the Philippines to their rightful owners
2. Britain would retain the conquests of the Ohio Valley and French India
3. Britain would recognize the Partition of Prussia
4. France would return all of Hanover to Britain
5. Britain would recognize Spain's sovereignty over Gibraltar
6. The border in Brazil would return to that of the Treaty of Tordesillas
7. Spain returned Portugal all of it's European territories
8. Spain would pay 500,000 Pesos in war damages to Portugal
9. Portugal could not build a single fort for the next 50 years
10. Russia would return the captured war subsidies
11. Frederick Wilhelm II would abdicate his throne and accept the rank of duke
12. The Hohenzollerns would swear fealty to the Holy Roman Emperor
Partition of Prussia
-Everything west of the Elbe would be made into new electorates or incorporated into current ones
-Russia received East Prussia
-Austria received Silesia
-Bradenburg proper would be returned to the Hohenzollerns
-Sweden received Pomerania
Ok so this is my rough draft. Tell me what you guys think.