Remove the cream cheese from the refrigerator and let it come to room temperature, about 30 minutes. This ensures smooth mixing without lumps. Pro tip: Cut the cream cheese into small cubes to help it soften faster.

Grate both the sharp and extra-sharp cheddar cheeses using the large holes of a box grater. Freshly grated cheese melts and combines much better than pre-shredded. Pro tip: Keep the cheese cold while grating for easier handling and cleaner shreds.

In a large mixing bowl, combine the softened cream cheese and mayonnaise. Use a rubber spatula to mix until completely smooth and well combined. Pro tip: If the cream cheese is still too firm, microwave it for 10-15 seconds to soften further.

Add the garlic powder, cayenne pepper, black pepper, and salt to the cream cheese mixture. Stir until the spices are evenly distributed throughout. Pro tip: Start with less cayenne and add more to taste – you can always add heat but can't take it away!

Drain the pimentos thoroughly and add them to the bowl. Gently fold them into the creamy mixture, being careful not to break them up too much. Pro tip: Pat the pimentos dry with paper towels to prevent the spread from becoming watery.

Add the grated cheddar cheeses to the bowl. Using the rubber spatula, fold the cheese into the mixture until everything is well combined but still has texture. Pro tip: Don't overmix – you want some chunks of cheese for the perfect bite and texture.

Taste the pimento cheese and adjust seasoning as needed. Add more salt, pepper, or cayenne to suit your preferences. Pro tip: Remember that flavors will intensify as the spread sits, so don't over-season initially.

Transfer the pimento cheese to an airtight container and refrigerate for at least 1 hour before serving. This allows the flavors to meld together beautifully. Pro tip: For the best flavor, let it chill overnight – the wait is absolutely worth it!