Preheat the oven to 350°F. Slice the Italian bread in half lengthwise and place cut side up on a large baking sheet.
Combine the butter, salt, Italian seasoning, red pepper flakes, garlic paste, and cheeses in a medium bowl and mix together with a fork until evenly combined.
Use a rubber spatula to spread the butter mixture out evenly on the cut sides of the bread.
Bake for 10 to 12 minutes, until the edges of the bread should “just” start to feel crisp.
Then turn your oven to a LOW broil and broil bread for 2 minutes until the cheese begins to lightly brown and the edges of the bread really crisp up.
Remove from the oven and slice and serve warm.
