In a large bowl, combine the bread crumbs, egg, and onion mixture. Add ground turkey and mix until completely incorporated.
⅓ cup bread crumbs, 1 egg, 1 pound ground turkey
Press turkey into muffin cups. Spread ketchup on top. Bake until the internal temperature reaches 165°F and the meatloaf is cooked through. (This takes about 1 - 1 ½ hours for meatloaf in a loaf pan and much less time, about 35 minutes or so, for the muffins).
¼ cup ketchup
Let meatloaf muffins stand 10 minutes, then carefully remove them from tin, gently removing and discarding the soggy bread from the bottom.
Notes
Source: Adapted from Annie's Eats, originally from Ina GartenYou're Gonna Bake It After Allbakeitafterall.com