Preheat the oven to 425°F (218°C) and position the oven rack in the center.
Cut the 1 loaf of French bread in half lengthwise and place the halves cut-side up on a baking sheet.
In a small bowl, mix the 1/3 cup softened butter, 3 pressed garlic cloves, 1/2 tsp salt, 1/2 tsp dried oregano, 1/2 tsp dried basil, and 1/2 tsp dried thyme until evenly combined.
Spread half of the butter mixture evenly over the cut side of each bread half.
Bake at 425°F for 5 minutes, until the butter is melted and the bread edges begin to turn golden brown.
Remove the bread from the oven and evenly top the cut sides with 1.5 cups shredded mozzarella and 1/4 cup shredded Parmesan.
Return the bread to the oven and bake an additional 3 minutes, until the cheese is melted and lightly golden.
Remove from the oven, let cool 1–2 minutes, then slice each half into 6 pieces (12 pieces total) and serve warm.