Preheat oven to 350 degrees.
In a small skillet, melt 1 tbsp butter over medium heat. Add garlic and saute until for about 60 seconds, or until browned and fragrant. Set garlic/butter mixture aside.
Melt another tbsp of butter in skillet. Add spinach, parsley, salt, and lemon juice. Saute until spinach is wilted, about 4 minutes. Set aside.
Cut a horizontal slice in each turkey breast, about 3/4 of the way through.
Line up bacon slices side by side on a working surface (a cutting board works well). Place each breast of turkey on the bacon so that the thin sides of the breasts come together to make a large rectangle (when you do this, the cuts you made will open in opposite direction).
Open turkey and brush garlic/butter mixture over insides of breasts. Fill insides with spinach and sliced Havarti cheese. Close turkey breasts (the closings will come toward each other and it will appear to be one long breast). Fold the bacon seal around the turkey.
Place wrapped turkey with sealed bacon side down in a 9x13 or other small casserole dish.
Bake for 30 minutes, or until thermometer inserted into thickest part of turkey reads 165 degrees. Turn on broiler and broil for 2-3 minutes, or until bacon is browned and appears crispy. Carefully flip turkey and broil other side of turkey for another 2-3 minutes.
Let turkey for at least 10 minutes before cutting.