Brussels Sprouts Flatbread

cup whole milk ricotta cheese

shredded Parmesan cheese, divided

small cloves garlic, minced

fresh lemon juice

crushed red pepper flakes

Kosher salt and freshly ground black pepper,

olive oil

thinly sliced Brussels sprouts

thinly sliced red onions

shredded mozzarella cheese

large store bought flatbread (individual flatbreads would work too)

Additional Parmesan cheese, for serving, if desired

Lemon wedges, for serving