Beef with brownies

1 (18.25 ounce) package yellow cake mix 1 (13 ounce) package brownie mix 2 (12 fluid ounce) cans vanilla frosting yellow food coloring red food coloring 3[...]

3 eggs 1/2 cup ketchup 2 1/2 teaspoons seasoning salt 2 teaspoons Worcestershire sauce 1/4 teaspoon ground mustard 1/8 teaspoon pepper 3/4 lb lean ground beef[...]

7 teaspoons olive oil, divided 1 1/2 cups chopped onion 1/2 cup chopped carrot 1 tablespoon minced garlic 1/4 cup all-purpose flour 2 pounds boneless chuck[...]

2 tablespoons olive oil, divided 1 (1-pound) boneless chuck roast, trimmed 1/2 teaspoon kosher salt, divided 1/2 teaspoon black pepper, divided 1 medium[...]