Mix together the softened cream cheese, shredded cheddar cheese, heavy cream and salt. Use a blender or food processor

In a separate bowl, mix together the mayonnaise, garlic, and salt with a small whisk. Set aside

Begin by spreading one side of each slice of bread with the mayonnaise spread.

Place two slices of provolone cheese on the bread.

Spread the cream cheese mixture over the provolone. Top with two slices of cheddar cheese. Place another slice of bread on top of the cheddar, mayonnaise side up.

When the bottom slice of bread is golden brown, carefully flip the sandwich over and continue grilling the other side until golden brown.