Cook the bacon. Remove most of the bacon fat from the skillet, leaving about 1 tablespoon for added flavor. Melt butter in the same skillet and add the Brussels sprouts, seasoning them with salt.
and pepper. Cook and occasionally stir for approximately 6 minutes until the edges of the sprouts start crisping and lightly charring.
Stir in the garlic and cook for about a minute until fragrant. Sprinkle flour over the vegetables and stir to coat. Pour in the cream, bring to a boil while stirring, then reduce the heat to low and let it simmer for 3-4 minutes.
Add the cooked bacon back into the skillet and mix everything together well. Remove from heat.
Top the Brussels sprouts with mozzarella and parmesan cheeses. Bake until the cheese is bubbly and the sprouts are cooked to your preference, approximately 15 minutes.
Adjust seasoning to taste and garnish with fresh thyme before serving.