In a small bowl, mix the softened butter, minced garlic, Parmesan cheese, minced parsley, salt, and optional red pepper flakes until fully combined. If making ahead, store in a small airtight container in the fridge for up to a week
Slice the baguette crosswise into 1-inch pieces. Spread the butter mixture onto all the cut sides.
1 small baguette
Heat a skillet over medium. Arrange the bread slices in a single layer in the pan (work in batches if needed) and cook for about 2 minutes, then flip and cook the other side. Once both sides are golden, remove from the skillet. Repeat with any remaining slices.
Notes
A cast iron skillet or griddle works well for this recipe, but any non-stick pan will do.